I'm a fan of stickers. So far my mac is a little sparse but I've been collecting stickers as I find them. I got a good selection at the guitar show this year but I've still to find a home for them.
I've some transfers on two of my guitars - one is themed from a trip to Hamburg with some guitar playing buddies. The other has a single sticker from the London underground.
I should really just give them to my daughters. At 5 and 7 they both love stickers ... I find them everywhere! Mostly in the washing machine and tumble dryer after a day of laundry.