My parents are super anticommunist but basically historically illiterate. As long as it’s not super obviously communist, a photo of the hammer and sickle, Stalin, Marx, Che, or Fidel they probably won’t recognize it. That said, any of you comrades have some good, ideally high quality, phone wallpapers? All the ones I’ve found online are kinda mid lol.
Here are some photos of East Germany. I suppose you could crop these; #3 #7 and #22 have no flags yet are iconic. I use photos of the DDR as a screensaver personally.