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.
AWESOME - Maybe with a Solar Light. Might even carve house number into the post and put lights behind it for a light up effect. How to make this garden lamp out of pallet wood and a mason jar. Bollard style lamp posts are easy to make and costs pennies!