When manufactures design cars they always (99/100) give them silver wheels. For one reason, any other colour just looks stupid. When people paint their wheels any other colour is makes their car look like they are just trying too hard and modifying parts for the sake of modifying. Sure this is probably not a sociably acceptable opinion, but its my opinion, and it happens to be the right opinion.
FYI: Black is not a colour., just leave them silver, or if you really have the need to modify something for the sake of modifying, the paint them black.