School art projects

At the last day of school, Célia's teachers handed to me all of Célia's art projects. They are normally hang all over the wall of the class. The walls are now white with no decoration, they are ready for the new member of the class' creations.
As for me, I haven't found any solution how to preserve those art works. I would like to hang some in Célia's room and keep most of them in a box.... but I think I will need a big box :-)