My daughter Katie sent me this site. I collect pigs and she loves origami. She was upset that there weren't any instructions on how to fold it.

Dollar Bill Origami by Bob Nienhuis

Origami- the art of paperfolding- comes in many styles and varieties. This page is dedicated to models folded from dollar bills, some original folds by Bob and some classics designed by others. [read more]

But wait! There's more! Origami shirt, Dollar Bill Tetrahedon, Money Origami, Folding Diagrams for the Egress: A Dollar Bill Door (All 20 Steps), Origami Ganesh (elephant), and Dollar Bill Animals in Origami.