Currently away, but I uploaded the other one I had on my camera roll. Probably doesn't help much with the perspective though.

I think I gave a false description. It feels smooth, but by dragging your nails on it, you can definitely feel the texture as well. Aren't vinyl liners typically completely smooth?

But I just took the outlet off and it does look like some sort of special wallpaper/liner has been applied, cause the holes have nicely cut edges for it.

I had to remove this part, as otherwise it got flagged for "brainstorming post", but even a clue on what type of coating this is would help me tremendously.