Newell's BBQ Blog has some pretty neat pictures of bbq smokers he built out of simple garden variety materials. There are posts including a bbq smoker made from a flower pot and another made from a trash can.
TwoThirds.org also has a version of the flower smoker posted with pictures of some ribs cooked in the improvised terracotta smoker.
Never Trust a Skinny Chef has more pictures of another terracotta flower pot used as a smoker.
And lastly, here's a series of photographs featuring Alton Brown's version of the infamous smoking flower pot complete with an optional slide show.