While U.S. currency does change a little on occasional, the basic design of the notes has stayed fairly constant: green/black background, a portrait on one side, and a pretty picture on the other. These concepts take that classic design, and turn it on its head.They’re the work of designer Travis Purrington, and his philosophy was to create a currency that was forwards-looking, rather than reminiscent of the past. Rather than railroads and 19th-century landscape portraits, you get molecules, astronauts and silicon circuits. As Purrington explains:

via These Dollar Bill Concepts Are Better Than The Real Thing.