To make an origami Christmas tree, you will need a square piece of paper. First, fold the paper in half diagonally, then unfold it. Next, fold the paper in half horizontally, and then unfold it again. Now, fold one corner of the paper to the opposite corner, creating a triangle. Then, fold the triangle in half to create a smaller triangle. Finally, fold the paper in half again to create a square. You should now have a triangle with a square attached to it. To create the Christmas tree, unfold the triangle and then fold the two sides inwards, creating the shape of a tree.