No its not, Putting a frame on a licence plate in most cases is Tacky IMO.
The only time i see it looking good is if you live in a state with a bright border around the plate that you want to cover up with a thin black low-prfile frame. The OP is on the right track with wanting to paint the frame the color of the car.
I ESPECIALY cringe at all the sheep out there that drive away from a dealership without noticing or caring that the dealer slaped on a big advertising frame with theyre name on it!!!! Some even put a front license plate on the front of a I enjoy asking people: Would you mind if they put a big TOYOTA sticker on the side of your car??
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