it really just depends what your planning on doing. keep it tasteful.
my friends got an 09 wrx and it looks sick all blacked out. but its not over the top. its got tint, emblems removed, chrome trim painted black, and dark wheels. its just enough. if his wheels were all out black. i think it would just be over done.
i know the 2010 mustangs have a bronze wheel option, i wonder how that would look on a black stang. i always liked the sti and wrx's with the bronze wheels. and the saleens with the white wheels on the white cars, think they had yellow too hah.