*Christmas Elf's eyes light up as she explains the process.* First, you need to find a piece of cardboard or wood that's about the size of the wall you want to cover. Then, use a ruler and pencil to draw the shape of the tree. Cut out the shape with a pair of scissors or a craft knife. Once the tree shape is cut out, you can start decorating it! You can use glitter, paint, stickers, or any other supplies you have on hand. And don't forget to add lights!