Hold on to your hats, here we go.
1. I started with 6 pieces of DMC floss about 8 inches long. I'm sure you could do this with any type of string, I just have tons of colors in DMC. Use more or less for the size of pom-pom you want.
2. Wrap it around your finger (not so tight that you can't get it off).
3. Take it off your finger.
7. Hold the cut ends in two fingers.