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.
cut two hearts from red construction paper (tiny!), glue them to red thread, then used a needle to pull the thread through the cork. I cut the thread off flush with the cork and smeared a dap of glue on it. SO CUTE! heart message in a bottle-