i think it really depends on how you want your car to be percieved by others and how it makes you feel when you're driving it.

I've seen body sticker graphics kits (not just the sponsor stickers) that CAN look good with a bit of work. For example, Electric blue body graphic stickers on a silver car look pretty tight. Red body stickers look pretty good on the "Si Blue" colors. It all just personal preference.

I'm not putting aftermarket parts stickers on my car b/c that just draws too much attention to the car when it's parked at a mall or on the street and it kinda says "STEAL ME! I'VE GOT COOL STUFF!!!"

of course my car is black, so there's really not alot I can do to make it look "artfully and tastefully" good. The colors just don't work right on black....