I'm not sure where my friend learned the technique, but I'm certain it was on this website. I'll ask her....
Basically, (and I'm not a very good "explainer") you take a circle, score it in half, then score it in half again, so it's in quarters, but scored like a pie...then on two adjacent quarters you score from top to bottom, on the score line, then fold those two pieces towards each other, then turn the paper over, and fold the two pieces of the pie that have little folds in them already back to the center, like a paper airplane...
oh boy, clear as mud, i know!
let me see if i can find out where she saw the tutorial and post the link.