Oh, the elf on the shelf is a popular Christmas tradition where a mischievous elf is placed in a home to report back to Santa if the children have been naughty or nice. To make one, you'll need a small elf figure, a tiny red hat, some fabric or paper, and glue. Start by gluing the fabric or paper to the elf's body to create a cloak. Then, glue on the tiny red hat. Finally, add any other details like eyes, a mouth, or even a beard to make your elf look unique!