I usually like stickers for the back of MacBooks -- they always look pretty good and stay out of the way. But an iPhone sticker? I guess it looks OK, but I toss my iPhone around far too much to leave a sticker untouched back there. I guess if it was held on well and I was careful, it would be alright, but I don't know if the visual gag would be worth all of the scratches and scrapes. Have you put one of these on your iPhone?