the pipe type bong i made was from 3 coke cans.... i made it by cutting the tops out of all of them but the top, taped them up with some electrical tape and cut a hole around the middle of the bottom so i could fix a bowl to it.... the bowl was from an old puffer tube it was layered in tin foil so i wouldnt be smoking the plastic.... worked awesome.... well until it got so filled with resin i had to make a new one... but well....thats just my idea you can probably come up with better ones than that, but yeah thats how a 15 year olds mind works i guess, lol, Have a good one