I mentioned Pinwheels on Friday... here's a little tutorial just in case you've never made one before.
2- Draw two lines from corner to corner... a big X. Then cut along each line until you are about 1/8 inch from the center.
3- Put a pin through one corner of each triangle (must be the same corresponding side of all four triangles; like I marked in the third picture). When the pin is through all four corners stick it right through the very center of the paper- x marks the spot!
4- Stick the pin into the eraser side of a pencil, as far as it will go. AND BLOW! or run around outside, whatever you like.