Tear gas canisters used as flowerpots.
https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...562#post110939
https://www.homemadetools.net/forum/...764#post216681
https://www.homemadetools.net/forum/...595#post215942
https://www.homemadetools.net/forum/...300#post215042
https://www.homemadetools.net/forum/...432#post196793
