If you picked yourself shells, boil them in water with bleach and leave them to dry. To create a candle from the shells you can use old candle wax or paraffin wax. Melt the wax in the container, which preferably has a "notch" for easier pouring. If the shell is not stable on a flat surface, place the cup on to the establish before pouring the wax.

Cut the wick of a candle in length between five and seven inches(depending on the depth of shells) and attach it to a metal wick holder. When you have poured the wax into a shell, right at the bottom of the longest part of the shell put the wick holder, making sure not to burn yourself. If a metal wick holder can not sink, help you with a wooden toothpick. When the wax is completely cooled, you can use spark plug.