White looks great, but is hard to keep nice. The original Semcycle unicycles came in a choice of chrome or white baked enamel. The white ones also looked very cool, but the discontinued them after a short while. Not sure if this was because not enough were selling, or because they would lose their good looks too easily when scratched/dinged/ridden.
I actually wanted to do that, but decided against it for more then one reason. One, white is impossible to keep clean (Sub-problem being that I don’t care if it’s clean, so it’ll look crappy and always be dirty). Two, I have a yellow hub which I’d have to paint as well. Yellow just doesn’t work with white. Three, if I were to paint my uni, I wouldn’t be able to ride on it for at least a week, because I’d use at least three layers of paint, and two layers of shiny stuff.