Free Money from the Chapman Bros
Jake & Dinos Chapman recently defaced £20 notes at this years Frieze Art Fair in reaction to the rocketing prices in the art world.
The notes went like hot cake and started selling for £100 a pop, however I imagine you would have trouble paying for a round in the pub with it.
They have widened this project and are now giving away free downloads online. Grab one before they all run out, could make a nice little poster.