I have also seen similar centerpieces that use epsom salts instead of sugar. You could also sprinkle a mix of pearls/gems. Sand (or sugar), faux pearls, a 3 candle. An easy DIY wedding centerpiece idea.
DIY Home Decor: How To Make a Sliding Door for Under $40 — Apartment Therapy Tutorial
Love the burlap table runner and chunk of wood as a stand. Long table arrangement with a board running down the middle with mixed glassware, greenery, and candles. Greens, tans, and white table linens.