You might be surprised. Then again, maybe not.
German mass-market culture in the early 1910s was pretty much a cloying mix of stale stereotypes, but that tends to cover the fact that some extremely fascinating and downright weird stuff was going on. I'm not just talking Jugendstil and Secession (though that was interesting enough), but some downright batshit insane things. And in a very German manner of thinking it was widely assumed that if you didn't get it, you weren't intellectual enough.
If you mix that with the anomy of war (assuming we're talking a 1917 or 1918 victory - things look very different with a 1914 limited victory scenario) amd a sense of vindication and power, you could see interesting things. Many German artists loved the idea of doing things big. Many loved the idea of breaking conventions. You'd see a lot of kitschy stuff to glorify the victory (you saw lots of that anyway), but I suspect the main line would be something like - consistentism? An intellectual movement that glories in the demand of thinking things through to their final consequences. Kind of 'the thing that won us the war' - that the Germans were willing to look at horrible odds and apply their scientific genius to the most amoral things in order to win. Futurism meets Nietzsche for Dummies.
What art comes out of that... dull it won't be.