I remember making these in Girl Scouts!! Ice Candles: wax/crayons, old taper candle (you can just use a wick but a taper ensures wax is touching all parts of the wick for even burning), ice, old milk/juice cartons. Melt wax, place taper candle in center of carton, fill carton with ice, pour melted wax over ice. Let dry, pour out water and tear carton away.
Most comprehensive how to that I've found for homemade bug repellent candles. I plan on using all my baby food jars for ultra portable candles to take camping, outdoor events, and to use for prepping in general.