It's not common practice to spill paint onto a rug, but that's exactly what the latest exhibit at the Smithsonian Institute is displaying. Darren Waterston, an American painter and artist, recently released his artwork through an installation entitled "Filthy Lucre" at the Sackler Gallery in the Smithsonian. His exhibit is unlike anything that the gallery has displayed in recent memory. Instead of exquisite ancient pieces that evoke royalty, Waterston is…