Sorry if you were expecting a picture of one but I'm curious as to whether you believe this could work or not? A group of my friends and I had a debate for hours that has come up repeatedly in the last couple weeks so I'm just looking for some input and how you would try and do this. Obviously the Bong would have to be left in a freezer at all times unless being used and a glass bowl would have to be used.
It could totally work. The effort might not be worth the payoff, it would be novel though. You'll need two concentric cylinders, with a way to cap off the bottom of the inside cylinder. The other tricky bit is going to be removing the interior cylinder from the ice. Fill, freeze, extract, put in stem and smoke. I just stuff my bong full of snow.