Its a marbled / textured finish, probably applied by hand, possibly what is called a ‘scumble’ finish. Depending on the colour it could be a faux- travertine, or just a lighter-darker’marbled’ colour combo.
The intent seems to have been to not have a solid flat colour backdrop, and the rectangular join lines would have made it look even cheaper.
Thank you so much. I had given up, but I’m glad to see this for two reasons:
Jazz architecture?
That looks to me like a plain cinder-block or concrete-block wall. The dark spots are caused by shadows in the texture of the surface.
Here is another.
I can almost see words scribbled in there. B…E…S…
Ah, got it - “Be Sure To Drink Your Ovaltine"
The DVDs are without commercials, although I saw Mrs. Olsen (It’s the richest kind!) playing an accessory to murder in a Maverick episode.