Often simplistic can be the most elegant. Crystal decorations such as candles or a bowl can make the dining table rich with reflective light without being too distracting. If you prefer a more traditional style, garnish your table with a decorative cornucopia filled with fruits. This creates a dining experience rich with charm and practical as guests can snack on the centerpiece.
For the truly ornate, one can go with an ice sculpture to commemorate the holiday. If you can find an ice artist, this is a lovely idea for a centerpiece and clean up is water for the plants in the home!