Here is a project I did many many years ago when I was in Girl Scouts. You take a salt container, the big round one table salt comes in. Cut the top off the container. Wrap a wick around a pencil and balance on the top of the salt container. Fill the container with ice and then fill with melted wax. Let the candle set. Pour out the water from the ice and gently tear the salt container away. Trim the wick on the top and you have a beautiful candle. Since the ice melts as the wax hardens, the candle becomes full of holes.