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.
A bud vase filled with water, a wide flower (real or silk), and a small tealight. This looks like spring or country-simple, but you can do whatever flower you want (and tealight) as long as it creates a wide enough base for the candle.
[I like the miniature succulents as decorations!] Glitzy Old Glasses If your old, decorative glasses aren't holding water anymore, have them hold plants such as drooping string of pearls, reindeer moss, and miniature succulents.
DIY Wedding Table Decoration Ideas tall candle pillars with flowers inside and short mason jars with simple flowers. These will cluster in center of table on top of burlap- might be good for an outside summer/fall wedding.