At lowe's or similar stores, you can buy glass drillbits. A 1/2" one shouldn't run you more than $15; get one. Then, go about drilling holes in any glass objects you can find. Right now I have a sweet mini bong made from a bud vase, and a snowman-shaped bong made from an old glass syrup bottle.

The 1/2" hole will take the rubber stopper and slide from most bongs, so just grab a bowl at a local headshop, insert, and shtart shmokin'!