I just this morning discovered book spine poetry. Looks like a great thinking activity for my students. Just have to decide which classes I trust enough to try it with. Could be a huge messy free for all if all the kids were "turned loose" to try!
Take a look at this link
This type poetry could be called a cento which is a poetical work wholly composed of verses or passages taken from other authors; only disposed in a new form or order.
You can view many examples in the gallery link. And from there you are hyperlinked to lots of other sites.
Now I am going to go try one!