Tattoos may be permanent...
I really thought HP's "tattoo" concept (visible in action on HP's Music Web site) for click-wheel iPods was nifty: A removable, mildly adhesive covering that you could buy either pre-printed or blank, to customize the look of your iPod. Not everyone wants or needs something like this, but it sounded like a clever hack for the kind of folks looking for a bit of customizing. HP promises you can pull them off your iPod without leaving any marks.
After viewing this Web site I'm not so sure anymore.