Fortunately, no one seems to care about the color of your keyboard--only the music you produce. I think a white keyboard would look neat, but it would be tough to keep clean. I've seen a few white grand pianos and really liked the appearance. Of course, there's always a can of Krylon around the house and you could then spray the keyboard any color you like.

Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)