wool(lots of wool)
1.Cut out 2 pieces of circular cardboard with a hole in the middle(make sure they're the same size).OO
2.Thread some wool (any colour) through the middle of both circles, around then through the middle and around until you can't see the cardboard circles any more.
3.Push a little bit of wool(around the edge) so you can see the cardboard and cut in between the 2 pieces of cardboard.
4.Tie a piece of string between the pieces of card and slip the pieces of card out from the side (have fun).