Get all the empty cans you can find then fill them up with water and freeze them.
Then all you need to do is lay the can on a washcloth or towel(it helps keep it in place) and start to punch holes into the can with the nail. You can do any designs you want; random dots, swirls or even words. I can't wait for Halloween so I made one that said Boo! When your done just melt the ice, put a some sand in the bottom( if you want to make sure it doesn't tip over) and put your candle in then your done.