Wells's Noisy Nora is a grand example of a rhymed picture book text that could easily stand alone, even without her characteristic, finely detailed illustrations, as one poem in a collection like Sing a Song of Popcorn. If we begin to imagine all the picture book texts that could "cross over" into the realm of anthologized poems, it becomes easier to imagine the poems that might cross over in the other direction, into the realm of stand-alone picture books.
There are plenty of out there--one of my favorites is e.e. cummings "little tree" rendered beautifully book-length by Deborah Kogan Ray (and adapted into an actual story, possibly unnecessarily, by Chris Raschka). Several have mentioned the Delmore Schwartz-Barbara Cooney work pictured here, I Am Cherry Alive--enjoy Kate Coombs's reflections on it here. And a kind Booklist reviewer of my own Squeeze suggested that "The best poem, “How to Run Away,” could be a picture book in itself." What a compliment!
Of course, not all good or even excellent poems will stand up to a picture poem book treatment--and if we have exerted ourselves to percolate ideas and write poems from a "collection" point of view, it's likely that most of the poems written from that stance huddle too close to their flockmates to be comfortable out on their own.
I'm going to spend some time reflecting on what qualities make a poem picture-bookable and try to articulate them. I'm also going to be thinking which of my poems offer enough possibility for an illustrator, enough richness to warrant whole books to themselves. And then I'll start thinking again about the agent who might shop them for me!
Which of your poems are "bookable?"