WikiRhymer has about 6,000 rhyming words and phrases for "color" starting with...

culler
    duller
      colour
        discolor
          noncolor
            multicolor
              Muller
                Stuller
                  • off colour
                  Pure Rhyme Set #1 of 1 (Add to/Edit Set Members)
                  Words that have a pure rhyme on their last syllable only.
                  muffler
                    shuffler
                      End Rhyme Set #1 of 619 (Add to/Edit Set Members)
                      juggler
                        smuggler
                          End Rhyme Set #2 of 619 (Add to/Edit Set Members)
                          sulfur
                            sulphur
                              End Rhyme Set #3 of 619 (Add to/Edit Set Members)

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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
                                  Near Rhyme Set #1 of 42 (Add to/Edit Set Members)
                                  juggler
                                    smuggler
                                      Near Rhyme Set #2 of 42 (Add to/Edit Set Members)
                                      sulfur
                                        sulphur
                                          Near Rhyme Set #3 of 42 (Add to/Edit Set Members)

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                                          Rhymes made up of more than one word. For instance, "jealous" and "tell us" or "shaky" and "make me."

                                          We have no mosaic rhymes for "color".

                                          Mosaic Rhyme Set #1 of 1 (Add to/Edit Set Members)