A famous fractal is the Sierpinski Carpet:
Start with a large square. Divide it into nine smaller squares, removing the middle one. For each of the eight remaining squares, repeat this procedure, creating eight more square holes and 64 tiny squares. If you continue to remove the centers and you will eventually have no more area left!
Here are Fractal Pendants in Gold Steel, Bronzed-Silver Steel, Bronze Steel, and Black Steel. I use the Bronzed-Silver Steel one for my keychain and I love it! You can get your own here: http://shpws.me/OADr