Apple-http://smokingwithstyle.com/applepipe.htm

Gravity-http://www.smokingwithstyle.com/gravitybong.htm
Note: the metal piece they used can be replaced by a socket from a socket set if you dont have on.

Waterfall-http://www.geocities.com/hit_da_bong_420/waterfall.html

Regular bottle-http://www.weedguru.com/bong.php

Coke can-http://www.pothumor.com/mh2_sodacanpipe.shtml

Or you can do vaporizer method-http://www.waytoomany.com/vids/weed/homemadevap.php