For the ultimate frisbee tournaments, you might want to consider getting one of the Glow and Throw UFO Flying Discs and have your tournaments just after dark.
All you have to do to make your own UFOs is to pick your favorite colors of glow tube. Activate them and plug them into the holes on the Flying Disc. If you need a longer tube, you can easily connect two or more with the aptly named “connector piece.” When you are done with your creation, it will look something like a mad scientist’s Easter bonnet. But all you have to do is throw it to see the transformation – each line of color will become a 3D solid as it spins. You will be able to get some exercise at night, freak out your neighbors, and have fun all at the same time. Because remember, you can’t spell “UFO” without “fun!”
via ohgizmo, Product Page