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.
Glue random small items together, spray paint all one color and attach to mirror. Perfect dollar store project, and would look cool in a bright colour for kids using dinosaurs or other small toys. - Diy Home Decor Dollar Store