I collected some Soviet era posters, for the urban areas of my scenery.
They are resized and gathered in a pdf doc.
For modelling use I'll print them, cut them out and give them some uneven structure for the edges ( a ligther works well). Than I glue them with white glue. I always glue both sides, the poster itself and the surface, as this gives me some options for wrinkles and waves.
Side shot of my appartment building with a test poster