can't think of anything ridiculous, probably would just end up being my face. :P
Bank of kittens and cute feline creatures! Wearing funny hats! The bills would all be different shades of pink and purple!
...
:3
Cthulhu. Still more trustworthy than the federal reserve.
There is a fine line between clever and stupid.
Ron Swanson riding a bear.
I like sandwiches
Brian Fantana, that or Rainbow Dash.
I would have either a Dalek or a Tardis on it or both and David Tennant as the 10th doctor with his 3D glasses on the other side.
Ponies. Or I would have a picture of the note put in the center of the note causing a never ending tunnel paradox
Metal frontmen, James Hetfields, Rob Halfords and Dave Mustaines everywhere.
That or Digimon.