Thanks a lot to Reece over at guerrilla-gorilla for this little link. Pictogame is a fun and easy way to create several flash games with the faces of all your friends. Simply select a flash game from the extensive list, upload an image of a friend, use the easy crop tool to select their face from the image and enter a few messages (such as 'Well done you killed Andy!')and voila.
Couldn't be easier.