Oooh! Good ideas, everyone. Thanks!
I still haven't decided exactly, and I'm still open to more suggestions, but I may end up incorporating all of these together somehow...
It's funny, I was actually thinking of doing something reddish. Like some kind of red roan, with a twist... I like the fading spots idea. You guys have given me something to think about!
I'll definitely post a pic of it when it's done.