I know I don't post here that often, but I just came across a product from one of my favorite stores, CB2, that inspired me to pop on to DesignInsider and share a link. CB2 now offers wallpaper, and along with traditional papers with paste backing, they're offering adhesive papers designed for renters who can't make permanent changes to their spaces.
Personally, I'm thinking about ordering a roll of adhesive paper to apply to the inside of a big, tired-looking bookcase that could use a major refresh. I'm thinking a coat of paint on the outside and this adhesive paper on the inside, and it could be kind of fabulous:
Photo from CB2.com.