My 3 year old and I yesterday took all the Burger King Pokemon containers (red & white balls with a large plastic key chain hook on them) we had accumulated from their kids meal give-away and turned them into ornaments.
He took stickers, glitter and other odds and ends and decorated them up as gifts for his grandparents. They look really great. I sprayed them with acrylic sealer after they dried to help everything stay on.
They are plastic, so he couldn't hurt himself making them. Since we have quite a collection of Pokemon's it gave us something to do with all the balls instead of just having them lying around. The colors are great, and the key chain is the perfect ornament hook to attach them to the tree.