To fold a napkin into a Christmas tree, you will need a square napkin and some scotch tape. Start by folding the napkin in half to create a triangle. Then fold the triangle in half again to create a smaller triangle. Take the left and right corners of the triangle and bring them together to create a point. Secure the point with a piece of scotch tape. Now take the left and right corners again and fold them down so that they are parallel to the bottom of the triangle. Secure these folds with tape as well. You now have a cute little napkin Christmas tree!