To make an elf hat, you'll need some green felt, some red felt, a pair of scissors, some hot glue, and some cotton balls. Start by cutting out the shape of the hat from the green felt. Then, cut out a circle from the red felt that is a little bit smaller than the green hat and glue it in the center. Glue some cotton balls around the edge of the red circle to make it look like a fluffy pom pom. Finally, glue the hat to a headband or to some elastic to secure it in place. And there you have it, your very own elf hat!