Paper Christmas trees are made using a variety of techniques, but the simplest way is to fold a piece of paper into a triangle. Once folded, cut along the fold line, and unfold the paper to reveal a triangular piece of paper. Next, fold the paper in half again, and make sure the folds are as even as possible. Finally, cut along the fold lines to create a triangle-shaped piece of paper. This can be repeated to make a larger or smaller Christmas tree.