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.
I've seen similar "Wish" bracelets/necklaces, with beads, hearts or starts, they are a great idea for a "goody bag" treat for all ages! Wedding Wish Bracelet Wedding Favors. (Give your guests a knot as you tie the knot, too.