This is one of 2 of my throwing star ideas, I havent followed these directions myself yet, so im just guessing they are reliable, but i have made something similar, and it should work.

All you need is:

A CD
A pair of scissors
A marker (optional)

If you chose to use a marker, use it to make a design on the cd, make it symmetrical so it is balanced, as far as design goes, whatever you want as long as it is symetrical will make it fly. Now, if u used a marker, cut along your marks the way you want it to look. make sure its pointy, cuz pointy things are cool.
Anyways, after you have cut the cd (marker or not) you can throw it. Just throw it once at first, to see what it does, if it flies down, throw it at an upward angle, if it flys up, throw it down, and blah bloah bah, whatever. im sure your smart enuff to figure it out. anyways, then, go throw it at people with your ninja mask on (ill tell u how to make one of those in another egg) and make Hi-yaaa noises. good for at least n15 minutes of fun before the cd breaks and u have to make more.