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.
Mason jars are often used for decorating the home, wedding gifts, item storage and other creative crafts. Here are Cute Mason Jar Craft Ideas which can help you to repurpose those old mason jars for decoration or useful pieces.