I put similar ones to the first post on my ex's GAGT back in 00 or so. Looked good and she liked them.

Myself, I usually remove everything from the exterior of the car except my hash marks (painted on my previous GTPs, a bit different plan on the current) and inlays on the front and rear fascia (which will be shaved, well actually removed shortly).

Overall, subtle or simple graphics are fine. Most others are too much.