Cut a strip of paper from a magazine, wrapping paper, or anything else. Measurements depend on how big you want your stars to be... I used the height of a magazine and about 1,5 cm wide...
Put the long end of the strip through the loop...
Pull the paper gently as tight as possible, so it will automaticly form a pentagon.
Fold the short end to the middle of the pentagon.
Wrap the long end of the paper strip round and round the pentagon. It almost automaticly turns to the right angle.
Put the end of the paper under the previous 'loops'.
Start pinching gently on the edges of the form.
Your star will puff up on both sides.
This requires some practice and may go wrong a few times!
Also depends on the strengh and thickness of the paper...