I suggested rainbow as a haircolor option for the Autostyler in the past, but would like to merge the idea with a larger one. Let me choose two colors or a dualtone/multicolor option for when my character's hair is as much one color as the other. My hair IRL is red on one side and black on the other at the time I write this. If I call my hair red, or black, it is misleading. As it is as much one as the other.
Got more ideas for the AutoStyler? Here's a thread for it so we don't clog the Forums! :D