Specialty Gardening: What is the most unusual thing you've used as a container?, 3 by happgarden

happgarden wrote:
I have not done this but saw it and I guess the bright color might actually talk me into using a tire. plus these others i love and the birds will be hanging from my pergola since i want it tropical and i think these are too cool. hope i am not breaking any rules because i have not done this yet but found them.

the last one really looks southwest clay to me.
anyone ever used a tire to make a big concrete planter form?