Originally I did the $3 bill seen in the main site graphic to be the only graphic...but it was late at night and when I asked my friends online what they thought about it, I ran into a problem.  Since it was late at night they were all from other countries, and quite frankly, people from other countries have no idea about the specifics of US currency.  So...instead I opted to not use it as the ENTIRE logo.

Anyway, above are the Nixon, Strongbadia and blank $3 bill links.  If you're planning on adding your own faces to the blank one, I'd suggest (assuming you're using something like Gimp or Photoshop) that you make the layer slightly transparent so the scrollwork from the face area shows thru.  Makes it look a little more like the way the faces are done on actual bills.  Enjoy.