Pop Art images made easy!
Work smarter...not harder!
There are many free photo manipulation programs available to choose from online. A new favorite of mine is FotoFlexer, where you can make cartoon images, painting effects and these bold Pop Art images in seconds. They make quite a bold statement in the hallway and are a fun way to introduce a new group of students outside of your room.
Also try: http://bighugelabs.com/, http://www.picnik.com/