In 2010, researchers developed a method where a sheet of composite material can self-fold when an electrical current is passed through it. In 2011, researchers were able to get a polymer sheet to shelf-fold when exposed to light.
Bright, colorful craft idea. Not to mention you can find fallen branches outside for free! I had a craze for making paper cranes a while back and filled the family Christmas tree! I sourced some metallic and iridescent Origami sheets which looked really pretty.