It is actually quite simple to make a Christmas tree napkin! Here are the steps to follow:
1. Start by folding a square napkin in half to make a triangle.
2. Then, fold the triangle in half again to create a smaller triangle.
3. Next, take one corner of the triangle and fold it down, creating a point at the top.
4. Finally, fold the other two corners down to form the trunk of the tree. You can also use a napkin ring to hold the tree in place. And that's it! You now have a festive Christmas tree napkin.