I'm wondering if it may be useful to start utilizing specific [number]_tone_* tags, such as three_tone_*, four_tone_*, five_tone_*, etc. This can help to find posts by using the specific number of colors/tones that are present, in a similar fashion to the two_tone_* group of tags (two_tone_fur, two_tone_hair, etc). I decided to make this as a result of topic #27120.