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.
Cute, easy and simple center pieces! Buy rhinestones from Michael's or Hobby Lobby, glue them with a hot glue gun to some glass candle holders from the dollar store and voila! OR put glue on and dip in glitter!