In case you haven't seen it, here is a post with good images from our
evil twin, the "Comic Abstraction" show at MoMA in 2007, featuring pics of the only actual abstract comic in it, Rivane Neuenschwander's "Ze Carioca, no. 4" (which is based on an old Uncle Scrooge comic):
(And thanks to Brendan Monroe for reminding me of Neuenschwander, which is how I ended up finding that post.)