U.S. money was originally based of the Spanish dollar (coins, and then later switched to paper notes). Today's notes are made with a special blend of linen paper, a variety of dyes and inks that are used for security purposes, and specialized Litho plates. (I love the smell of fresh dollars because I can smell the ink and paper and it reminds me of being in the print room at KU).
There have been several designers who have tackled the project of coming up with ideas of new currency. (The U.S. government of course is not using any of these designs, but is soon to debut a new 100 dollar note). Below are some of my favorite ideas for a new look for our money:
When I find something I like I tend to just grab the image, and I try to mark the original creator, this does not always happen.