Use sand or pebbles. Some jars can be coated with glass paint to match colored bottles. 12 quart size jars are about Suggest different sizes. Small jelly jars are "quilted" creating a faceted glow from candle.
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.