Beautiful U.S. Currency Redesign

I just came across this great proposed redesign of the United States currency by Dowling Duncan.  I love the bold colors, clean modern design and how drastically different they are from the current currency.  What I really love is the various sizes, which lends itself to a stacking system.  Now if only a redesign of the U.S. dollar were actually underway.  For more proposed designs, visit the Dollar ReDe$ign Project.