i personally wont use a grav recreationally...ever, the only time i will is if its someone elses weed, and that is the method being used, but when it comes to smoking i perfer a nice tight bowl from either my pipe, or my bong, or whatever implement being used. Ive seen the gravity bong in my local headshop, and the reason why i think that most peoples look so horrible is that the ones in the head shop are tiny, and the reason people smoke gravs is because they want monster hits. Plus buying a grav from a headshop is completely obvious what your buying it for, think about it, who would smoke tobbacco out of a grav? its pointless, but weed, will get you high as fuck. but thats about all my knowledge of them.

And to make a nice looking grav its not too tough. First get a nice looking bowl from your headshop, get the kind for a bong, and get a bottle of sorts, plastic bottles work the best. then take a nail and head it and push it through the cap of the bottle to make a decent sized hole, then head the stem piece of the bowl and push it through the hole, this make the bowl unusable from then on out, take the bottle and cut the bottom of it off, and then get a pitcher, like the ones for ice-t, and fill it with water, then grav away! And the Straighter your lines and the more care you put into your piece the better it will look, and you can even paint it if you want something that looks cooler.