That's a great question! Folding a napkin into a Christmas tree shape is a classic and festive table decoration. Here's a simple step-by-step guide: First, fold the napkin in half diagonally to form a triangle. Next, fold the top corner down to meet the bottom edge of the triangle. Then, fold the two remaining corners together to form a smaller triangle. Finally, fold the bottom edge up to create the trunk of the tree. You can also add some embellishments like a ribbon or ornament for extra decoration. Happy folding!