Hanna Höch's "Cut with the Dada Kitchen Knife through the Last Weimar Beer-Belly Cultural Epoch in Germany," 1919
Otto Dix's "Mondweib" and "Die Skatspieler," 1919 and 1920
Works by Bauhaus artists/designers Feininger, Klee, and Moholy-Nagy
And, some cool stuff by Oskar Nerlinger, including "Berlin City Train"
There was also a painting by Friedrich Vordemberge-Gildewart that was essentially several straight squares with an actual straight-edge/right angle tool (whatever you call those things) nailed onto the piece.
Anyway, I went back to the library this afternoon to investigate typography some more, looking especially for the Modernists' take on the old Fraktur style/its use in popular media. Zing! Jan Tschichold had something to say. Note that Fraktur looks like this:

Grotesk is the German word for sans serif, z.B. Verdana or Helvetica (though both were developed later). Tschichold ususally refers to serif fonts as Antiqua because they come from ancient Greek and Roman alphabets. Anyway, this quote on die illustrierte Zeitungen of the 20s is from Tschichold, Die neue Typographie, 1927:
"Für die Notwendigkeit der Grotesk als Auszeichnungsschrift kann man noch den weiteren Grund anführen, daß sie die einzige Schrift ist, die der Photographie wirklich entspricht, und zwar durch die beiden gemeinsame innere Objektivität. Die Schnörkel und Ranken der Fraktur, dieser Beamtenschrift des 16. Jahrhunderts, gehören nich mehr in unsere Zeit und werden nie zu einer solchen ausgeprochen gegenwärtigen Druckform wie der illustrierten Zeitschrift passen."
Ho Ho! I think it's time to go back to the Zeitschriften (Die Dame, but also non-gender-specific illustrated newspapers of the time) to check out who is and is not in line with Jan. Also: Fraktur brings to mind propaganda posters from the 3rd Reich. It might be interesting to investigate typeface as associated with political propaganda. Were parties that called for traditional "German" values more likely to employ Fraktur? Probably.
P.S. I tried to put the Tschichold quote in Verdana so as not to offend him with my serifs, but the internet-device isn't cooperating. Also, Schnörkel is my new Lieblingswort auf Deutsch.