Does anyone have fun Photoshop ideas?

I've run out of ideas. I've done my friends in front of the Eiffel Tower, a pal on the NYC Skyline at sunset, someone hanging off the Empire State Building like King Kong, and myself as a ghost in front of a haunted house (using color dodge and outer glow). Any other ideas of something not too hard but challenging enough that it will wow my friends? I use a Mac and I have Photoshop CS3, if that helps. I also have a camera and a greenscreen available if I need to take a photo for it. Thanks!