There was one of those link blurbs on Jez earlier today that people rarely look at (ok, I rarely look at) that was about multicolor braided hair. An astute commenter pointed out they were photoshopped, but included pics of real multicolor braided hair:

And I still think it looks fantastic. I had no idea this was a thing. I have dark brown hair, but I bet I could do shades of auburn and copper and black.