A stainless steel, Titanium, Silver, whatever you would like to call it 510 would be cool.
I have a few nicks in the black paint on a couple of mine. I have thought about putting them on the big parts buffer I have and remove the paint, and polish the bare metal.
I love the black, but dang, if have the hardest times keeping up with them though.
Glow in the dark paint would be cool, at least I could find the darned thing.
How about one with black light luminescent colors and a black light LED. Cool.