I couldn't find how to do something on the Creative Criticism forun in AllPoetry, SO I asked. Next time I will read the help file better. (Or else take something to improve my memory). For those not in the CC group, it's an "in" joke. Unfortunately the "poem" does not fit last line definition, for which I need ashes and sackcloth.
Re: concretely, I put up a concrete poem on AP fairly early, ran a contest on concrete poems, and later posted a second one myself.

I enjoyed creating this fun little poem, with the last line of each tercet seriously enjambed. The comments people made were as much fun as the poem.