Well at a Strauss Discount Auto store [auto store chain available in only New Jersey and New York Metro area] They sell a Spray Paint....made for Rims....comes in only three colors, WHITE, SILVER, GUNMETAL, I dont know how well it works or what is needed to prep the rims and I dont know anyone who has tried it.

I dont know if AutoZone or Pep Boys sells these....its worth a check.