Nice picture!
It would be nice to distribute printed versions of it in protests like this OccupyWallStreet.
I think it would be a very bad idea. Almost guaranteed that someone tries to use one (universal rule people are dumb and in a large group one person will be in the 10% decile). Even worse would be if the merchant doesn't notice and it gets to a bank.
The Secret Service is rather diligent about these things. Even if nothing happens it will create bad press. Everyone knows how the press manipulates and distorts the story to gain rating. Anyone think a story about counterfeit bills promoting bitcoin at an anti-Wall street rally is going to be reported accurately and fairly?
Personally I wish the OP would change the design to look less like US currency. Why do we want a bitcoin bill to resemble a fiat currency?