DarkWolf Said: I saw someone once with Sonic on his/her car several years ago. It looked like a simple, single-color vinal decal, the Mario Car obviously being more complex.
On a mostly unrelated note I made another impulse buy on eBay last week (didn't make a topic about it since my previous impulse buy topics weren't popular :P), and it was a chrome 10 cm x 10 cm (approx.) Autobot logo for my new car (which I have yet to pick up).
Wouldn't you get bored of a car or a room that looked like that? I suppose you could sell the car to a superfan when you're tired of it. But if you went to the trouble of designing that, then you're probably a superfan yourself. :P The room would be harder to sell, and it would suck if you weren't tired of it yet but had to move.