Can also be used as an envelope for carrying items securely.
It's disposable, recyclable, sustainable, environmentally friendly plus widely and freely available.
Step 1: Making a paper square from a rectangular sheet
You are going to use basic paper folding techniques to crop it square.
Use your finger/thumb nails to form sharp, straight creases. If your nails are too short, use the edge of something like a credit card or a plastic ruler.
Step 2: First corner fold
If you have made a paper aeroplane, or tried some basic Origami, this move should be famliar to you. Or you may be lucky enough to have some square paper already.
Step 3: Folding the waste piece
Turn up the bottom short edge to make a horizontal fold. This should be parallel to the top edge of the paper. A square will be created when this horizontal fold intersects the bottom right end of the first diagonal crease.
Step 4: Tear off a strip
(If you were making a paper aeroplane, the piece you are now discarding would form its tail).
Step 6: Triangle
Crease the centre fold sharply.