If you are interested in a non-permanent 'tattoo' for your car, you can do something like this. It's a vinyl application that does no damage to the underlying paint. Many business are using this on leased vehicles for advertising.
The picture is of a 'full body' application.
[url=http://keitel.net/bug_black_corner.jpg]http://keitel.net/bug_black_corner.jpg[/url]
Tattoo your iPod