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.
Love the flowers on the wood round! Here's a great, rustic centerpiece idea! Wood stump with a taller candle wrapped in twine, surrounded by tealights with a few paper flowers! Would look great at Tapestry House if you are going for a rustic feel!