Instead of white dresses, Black Dresses with colored shoes, and matching flowers. Groomsmen all black with colored tie matching the girls. Then my bouquet with all the colors mixed in.What a cute idea!
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.