I utilize Art Storage Cases to hang my children’s artwork in our playroom. I switch them out with the changing seasons & holidays. Most of these you can store artwork right inside for easy swapping!
http://www.michaels.com/studio-decor-art-storage-case-black-9in-x-12in/10276120.html#start=9
I have also used photolines to display artwork. I purchased these at Target. They were reasonably priced and very easy to hang.
http://www.target.com/p/loft-by-umbra-retro-photoline-black/-/A-16627837
