There are all sorts of cheap and cheerfull radio-controlled flying gadgets out there nowadays. Planes, flying-saucers, helicopters etc.
How about constructing a football made from durable-polystyrene pentagonal mesh with a hovering mechanism inside (similar to the R/C UFO)
Head over to a deserted
football pitch one afternoon with a couple mates, and a camera. With the camera rolling, pretend to kick the ball and you can reinact famous goals, do trick shots or simply just goof around. Playing the video in real time will always seem like you're running it in slow-mo - this thing has youtube written all over it.