Make a cone from construction paper with a radius of about 8 to 9 inches following our a basic cone hat tutorial.
You can also print out this birthday hat template on A4 or Letter size cardstock. The resulting hat will probably be a bit small so you will need to attach a chin strap. Do this by punching a pair of opposite holes near the base of the hat. Attach the ends of an elastic string around the holes.
Create about 15 to 20 pieces of colorful "hair" using either of these materials: