Dollar Tree has some great, inexpensive items perfect for craft projects. In the framing area, they have several hanging frames with artwork in them like a 3-D wall hanging. These are great to remove the art inside and decorate however way you want.
In my case, I did a Halloween hanging box, using mostly Dollar Tree Halloween trims, plastic bats, witches hat and pumpkins. The paper that I used to cover up the original background was a Graphic 45 Halloween paper. Also Tim Holtz skulls, bats, cameo and Halloween Witches paper doll.