What mod adds real-life backdrops like this?

[blontk]

[shadow866]

I could be wrong but looks like it was just photoshopped into a skyscreen.

[yatol]

you pick something from google image

you replace wall x texture with it

and you take a screen of your char in front of the wall

[RomeoZero]

In my mod here AVATAR Korra,I have a photo wall in misc items.You can apply any texture fit to it to make screenshots as a background.So it's possible.