These are cheap and easy to make. And if you get a few of them just as cheaply you can put a candle or a few leds in them and hang them in your garden or at you party.
X6 Cd's or DVD's
Pencil or Pen
Dremel - with a cut off wheel
Any sort of light:
even a candle if you leave a side off
Step 1: The corners
First of all line the protractor up with the middle of one of the cd's and use the pencil to mark a line every 90 degrees to the edge of the cd.