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.
Wine Glasses Use wine glasses as candleholders. To cast romantic shadows at the dinner table, place a votive candle in a thick-walled glass, anchored in a bed of sand or small pebbles (it makes wax cleanup a snap). Great use for all those glasses I have!