lots of ways to do it. Bobbert posted a cool 'ice' one about a year ago, (forget what the material was called) Big tube, hole on top. Bowl basically. The ice one was made by getting a tube of some sort (i used a vacuum cleaner extension) and wrap a bunch of wet paper towels around it and freeze. Pull it off, and put more wet paper towels on the bottom for a base (to cover one side) i used a knife to make a hole on the top, and a glass bong bowl. (or just put a joint/blunt in it)