Measure and trace a square on your paper, approximately 8 inches by 8 inches, with a ruler and pencil. If you want a larger or smaller paper windmill, modify the measurements. Cut out the square.

Create the perfect square shape, if you are working with traditional 8-inch by 11-inch paper, by folding the bottom corner up, across the sheet and to the middle of the other side. Cut the folded corner off to create a square.

Fold the square diagonally so that two opposite corners touch. This should create a line that breaks the square into two triangles. Do the same in the other direction so you have four triangles demarcated by fold lines.

Punch a small hole in the center of the square. The center of the square will be where your two fold lines intersect. You can also use a safety pin or sharp pencil to create the hole.

Cut a slit from the tip of each of the square’s four corners. It should go approximately halfway to the center hole. This should create four identical flaps for your paper or cardboard windmill.

Punch a single hole in the corner of each flap--four holes total. Try to make the holes in roughly the same place on each flap.

Prepare your straw by measuring about an inch from the top and punching a hole. Set it aside until you have completed the paper windmill and are ready for attachment.

Take your windmill and fold each corner with a hole toward the center. Try not to crease or fold the paper. Each flap should curve toward the center so that all five holes align.

Insert the brad or paper fastener through all five holes.

Pass both prongs of the brad through a bead and insert them through the hole in the straw. Secure the windmill to the straw by folding the prongs of the paper fastener down tightly against it.