Robert J. Lang origami mammals and the koi (doesn't this look like a good opportunity for a softie?)
Here are a bunch, I like the butterfly. A beautiful little vase. Make a sweet rose bud or a Christmas tree. The longest origami train. Build your own business card polyhedra.
Interesting, but difficult making 4 cubes.
Erik Demaine's Unlocking Puzzling Polygons animations are very very cool!
A polyhedron is a three - dimensional figure made up of sides called faces, each face being a polygon, here paper models and how to make them.