For one thing, they're made to be removed and replaced as much as you want, so while attaching one to the back of your iPhone, you don't have to worry about making one minor mistake and having to stare at it every time you check Twitter. The skins themselves have little grooves on the surface, which we were told acted as air channels, so if you ever did get a bubble underneath, it's much easier to squeeze out.
But the most interesting part of skins like these isn't on the side towards the phone, it's on the side away. Musicskins is one of the biggest licensors of art for device skins, and as you can see in the gallery below, they've got all kinds of different famous and infamous licenses to stick on your iPod, iPhone or Macbook. They just recently made Apple history, too -- read on to learn how.