Another careless bike owner: I'm not good at cleaning my bikes. Every time I bring my bike in to LBS, they remark: what a dirty bike. (Oops) I would not buy a white bike. My bikes are each:

silver
brown-grey (folding bike) I love this dahon for its lightness, nimbleness and convenience. Don't care for the colour. But it was the best model for me.
orange with black accent
red with black accent
purple