I like to use unusual shit for my bongs, shop bought ones are good but theres nothing like the satisfaction of the first toke off a creation you made.
I've even smoked through mother Earth.
We were in Germany and sat on this mountainside (forested),we built a mound of earth and then made a narrow channel through it,we then used two chillums, one at each end sealed off with clay,and then one of my mates applied the flame and the tokin could begin.Awsome!