WikiRhymer has about 1,000 rhyming words and phrases for "color" starting with...

Words that have identical vowel-based rhyme sounds in the tonic syllable. Moreover, that tonic syllable must start with a different consonantal sound.
culler
    duller
      colour
        discolor
          noncolor
            multicolor
              Muller
                Stuller
                  • off colour
                  Words that have a pure rhyme on their last syllable only.
                  muffler
                    shuffler
                      juggler
                        smuggler
                          sulfur
                            sulphur

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                              Words that "almost" rhyme on the vowel-based rhyme sound of the stressed syllable like: be/eat or maybe/shapely. (Click for more info)
                              muffler
                                shuffler
                                  juggler
                                    smuggler
                                      sulfur
                                        sulphur

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                                          Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."
                                          • the + birr
                                          • the + blur
                                          • the + bur
                                          • the + burr
                                          • the + cur
                                          • the + der
                                          • the + err
                                          • the + eure
                                          • the + fer
                                          • the + fir
                                          • the + fleur
                                          • the + fur
                                          • the + furr
                                          • the + her
                                          • the + Ker
                                          • the + Kerr
                                          • the + mer
                                          • the + Murr
                                          • the + myrrh
                                          • the + per
                                          • the + pere
                                          • the + pur
                                          • the + purr
                                          • the + Sher
                                          • the + Shir
                                          • the + shirr
                                          • the + sir
                                          • the + slur
                                          • the + spur
                                          • the + stir
                                          • the + sur
                                          • the + swor
                                          • the + ter
                                          • the + Thur
                                          • the + ture
                                          • the + ur
                                          • the + we're
                                          • the + were
                                          • the + whir
                                          Words that rhyme on the vowel-based rhyme sound of the last syllable only (for instance: “maybe” and “eat”). Near End Rhymes generally (but not always!) suck. Nonetheless, we provide them for you just in case you may find something useful.
                                          berk
                                            cirque
                                              clerk
                                                erk
                                                  irk
                                                    jerk
                                                      lurk
                                                        merc
                                                          murk
                                                            perk
                                                              quirk
                                                                shirk
                                                                  smirk
                                                                    sterk
                                                                      work
                                                                        twerk
                                                                          berserk
                                                                            rework
                                                                              overwork
                                                                                Berke
                                                                                  Birk
                                                                                    Bourke
                                                                                      Burck
                                                                                        Burk
                                                                                          Burke
                                                                                            Clerc
                                                                                              Clercq
                                                                                                Derk
                                                                                                  Dirk
                                                                                                    Kirch
                                                                                                      Kirk
                                                                                                        Merck
                                                                                                          Merk
                                                                                                            Turk
                                                                                                              • desk clerk
                                                                                                              • all in the day's work
                                                                                                              • at work
                                                                                                              • busy work
                                                                                                              • do their dirty work
                                                                                                              • get down to work
                                                                                                              • leg work
                                                                                                              • many hands make light work
                                                                                                              • out of work
                                                                                                              burl
                                                                                                                curl
                                                                                                                  girl
                                                                                                                    herl
                                                                                                                      hurl
                                                                                                                        pearl
                                                                                                                          perle
                                                                                                                            swirl
                                                                                                                              twirl
                                                                                                                                whirl
                                                                                                                                  whorl
                                                                                                                                    purl
                                                                                                                                      furl
                                                                                                                                        unfurl
                                                                                                                                          Berle
                                                                                                                                            Birle
                                                                                                                                              Earl
                                                                                                                                                Earle
                                                                                                                                                  Erl
                                                                                                                                                    Kerl
                                                                                                                                                      Merl
                                                                                                                                                        Merle
                                                                                                                                                          Pearle
                                                                                                                                                            Perl
                                                                                                                                                              Searle
                                                                                                                                                                Shirl
                                                                                                                                                                  • pin curl
                                                                                                                                                                  • call girl
                                                                                                                                                                  • cover girl
                                                                                                                                                                  • pinup girl
                                                                                                                                                                  • working girl
                                                                                                                                                                  masterwork
                                                                                                                                                                    plasterwork

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