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.
Kids Craft Butterfly Stained Glass Suncatcher Kit with Birds, Bees, Using Tissue paper, Arts and Crafts Kids Activity, project could use overhead projector paper and black construction paper and tissue paper strips/pieces
Five Fantastic Spring and Summer Wedding Color Palette Ideas with Green