NO NO NO....I don't have a MP3....but I would NEVER put stickers on the paint....some little decrative thing on the window maybe...but graphics on the paint....nope....just not my thing...if I want the car to look like that..I would save my dollars and have it PAINTED on.
I really don't care for decals on cars at all. There's a guy here in town that drives an Hyundai Accent and it has the exact same shark decals on it as the painted ones in the Fast and the Furious(forget which guy had that in the movie on his car)...needless to say their were a lot of snickers when people first saw that car!
I used to like putting decals on my old CRX. Not big flashy ones, but a couple small ones here and there, and a big one on the 'eyebrow' (windshield)area. But after a few years, they don't look very nice anymore as they can't take too much abuse from the sun. Especially after hearing so many stories of the weak paint on Proteges, I think I'll leave my yellow MP3 decal-free this time.