Are your wheels OEM?
What year?
Could have 17 or 18's.
Color depends on your taste and look you want.
I've found a quick&easy update for stock "silver" wheels is
to use DupliColor Shadow kit. This gives a hyper-black look.
Basically its a tint with a clear coat applied after you get the
darkness of the tint you want.
Not a fan of ya-ha colored wheels--yellow,green etc.
Just sayin...