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Joseph Wu’s Origami Page has alot of information about origami in general, including information on books, organizations, etc. [1]
As with all these designs, try to start with a relatively clean, crisp bill. [2]
Folding paper money (or “money origami”) is my one true creative output. [1]
It helps to go over the fold with a fingernail on a flat, hard surface. [2]
There is only a limited amount of dollar bill origami, but so much material information, there is much that could be adapted. [1]
If you fold too little, the shirt will appear too long in the end. [2]
Sy’s Paper Folding Page has a lot of designs, most are traditional (square paper), but a few are dollar bill based. [...] My best original designs include spiders, eyeglasses, sailboats, and framed portraits. [...] The only shame is that I haven’t seen any instructions or links for instructions for any of the work collected here. [...] I got started in high school when I learned how to make a ring out of a dollar bill. [1]
Here is a selected list of Web pages dealing with Paleontology and Fossils. [3]
There are instructions for creating the catapult in streaming video format. [1]
Start by folding the bill precisely in half lengthwise. [...] Once you’ve done a few, you can try folding the whole thing into the reverse side, leaving the obverse side out. [...] Now you will fold inward in the same direction, tucking the previous fold under the “collar” created in step 4. [2]
Sources:
[1] Money Origami
[2] The Shirt
[3] Paleontology and Fossils Resources