You will need
Bare Conductive Pen
3V Coin Cell Battery UK: Kitronik / US or UK: Digi-Key
Step 1: Download the Template
Step 3: Draw on your circuit
Make sure the positive of the LED (long leg) goes to the positive of the battery. Draw in your circuit on the back of the template using your Bare Paint Pen. Make sure not to short circuit the components.
Step 4: Fold up Elf
Before you fold up the body, add a rubber band or ribbon to the top so you can hang your elf on your tree.