I think these two are my favorites. They kinda hurt my eyes but I love the intricacies of them. If you look at the "Love Counts" poster, you can see the use of numbers (clever!) to create the image. You can also see the theater name in one of the lines toward the bottom but you have to work for it. They're mostly in German so I don't know what half of them say.
Some of his designs get a little "messy" too, though.