From (US) Country Living magazine's look at the Photojojo book, here's an idea to play with. This link will tell you exactly how to make a collage like the one pictured (and who says it has to be all one photo? and aren't there lots of library-related image possibilities? oooo yes.).
The Photojojo site has lots more (free) ideas for playing with photos, and plenty of scope for teacher librarians looking to make their libraries more interesting/engaging/fun. And once you have your CD cases in place, who says the artwork has to stay the same?
All you need is a little time and some simple items: CD cases, photo paper and cardboard. Nothing expensive there.
Photos of book covers? Kids? Kids reading? Lots of possibilities...
*GIFSL good ideas for school libraries