iPhone owners on the hunt for the coolest decals need to check out the new Polaroid iPhone Decal from Photojojo. This decal disguises your iPhone 4 as a Rainbow OneStep Polaroid Land camera.
I have to say that the Polaroid iPhone Decal is quite convincing. The decal attaches and detaches to the back of your iPhone 4 without leaving any sticky residue behind. My only knock against this decal is that it is one-time use only.