The process of making a tree from Christmas lights is actually quite simple. First, gather a bunch of Christmas lights, preferably in a single color or a combination of colors that will create the desired effect. Next, start with the bottom layer of the tree by stringing the lights around a base or frame, making sure to spread the lights evenly. Then, create the second layer by hanging more lights up higher, creating a triangular shape that will eventually form the outline of the tree. Finally, finish the top layer by adding a few more lights to give the tree a full and lush appearance.