I covered two cardboard mannequin forms I had with paper. The small one is covered in music from Handel's Messiah, purchased for $1 at a library sale in D.C. a couple of years ago. The big one is covered in street atlases of Metro Boston, purchased from a thrift store around the same time.
I used Mod Podge Matte glue to cover these two forms. It can be used as both an adhesive and as a finish. It works well, although it dries very quickly.
Here's how they looked before:
Big difference, right?!