What kind of product can I use to display book covers on a wall?

Question:I have too many children's book covers to use regular expensive frames, and I would like to be able to change the covers out easily since they will be displayed in our playroom. Thanks for any suggestions!

Answers:
I was going to suggest a laminating sheet that can be purchased at most craft stores. It can be stuck right over the book cover and right onto the wall. However, if you want to change them, this would be hard to do with this idea. You might want to find some page protectors and slide the covers into the protectors and then adhere them to the wall somehow. You can get them that open from the top, so it would be easy to pull out an old cover and slide in a new one.