You will need:
Instruction step by step:
1. Cut out a square of cardboard.
2. Cut it as shown in the picture.
3. Bend every second angle to the center in turn and glue it.
4. In the center of a pinwheel glue a decorative element, and on the other side glue a stick.
5. If you want the pinwheel not to be decorative but to rotate, then instead of gluing a decorative element fasten a paper part to a stick with a pin and with a bead on the end.