These are so much fun to make that I had to make them in colors. The rainbow one is particularly striking, and I'm really very fond of the Ravenclaw-colored one also.
I'm told these make great juggling balls, but since I can't juggle I can't really attest to that. They are really great for tossing around.

These ones are about 2 inches wide, and make great chunky pendants or keychains. $10 each and available in any color you like!