To decorate a dining room table for Christmas, start by adding a festive tablecloth or runner. Add some festive napkins, either matching the tablecloth or in a contrasting color. Place a centerpiece in the middle of the table, such as a Christmas wreath, a bowl of fresh fruit, or a vase of poinsettias. Add a few Christmas candles, either in holders or placed directly on the table. Finish off the look with some Christmas ornaments or decorative Christmas figurines placed around the centerpiece.