The holidays are a time of indulgence, but there's no reason to throw out all of those napkins when they can be used in festive ways. Folding a napkin into a Christmas tree shape is a simple and fun way to dress up your table for the season. Here's how to do it: 1. Start with a square napkin. Fold the napkin in half to create a triangle. 2. Fold the triangle in half again, this time creating a smaller triangle. 3. Open up the napkin and flip it over. 4. Fold the napkin in thirds, with the bottom third being