Once made a bong out of a water bottle, a hollow highlighter and some foil. I did this because me and my best friend at the time went to the store at like 2am, high as hell and bought a bunch of different fish to put in the bong, we wanted to get fish high. Ah, good times
I've also used a crack stem to smoke BHO before and when I was just starting to smoke, me and the same friend were in town, walking around, looking for something to turn into a bowl and in someone's yard, we found some attachment for a hose that we took then broke apart and successfully made something that at least worked good enough to get a hit off of.