Thanks to my friend Staci, who was always creating random cute things for me when we were roomies back in the day.
Make leprechaun hats out of styrofoam cups and green markers! Simply draw whatever pattern you want on the outside of a styrofoam cup. If you want to get super fancy, make a simply design on the inside lip of the cup.
Then, bake the cup in the oven for a few minutes and it shrinks to leprechaun size. The edge up the cup curls up to make a brim.