Paint it bright pink with purple dots all over it. That would look really cool.
Seriously, what is up with this question? Do you ask people what shirt you should wear in the morning too? What food you should eat?
Show a little originality and paint it whatever color YOU want. It's your car, you have to look at it more than the rest of us, and you have to be seen in it.
Ok, maybe I'm being a little harsh. Blue. Paint it blue.