Recently, the museum where my girlfriend works, had a vernisssage for their new exhibition, that deals with the ego. They wanted the visitors to present themselves and their ego on photos in return for free drinks. Cool.
I built a small app in Processing, and linked it to the Last.fm Lovebutton from an earlier project. Used a small vbs script (Windows only) and then we had a small application that takes a screen dump, saves it to a folder and automatically prints it, when the user presses a button.