While my background editing skills are very limited, I can make (some) day backgrounds into night backgrounds.
Feel free to send me your day backgrounds you want to be turned into night 
Just make sure that the image you share isn’t copyrighted. Crediting my Instagram @amphia.epi in your story is appreciated.
If your background has many lights, a lamp, or many small light sources, then I may not be able to do it.
Examples
INT. MUSEUM INTERIOR - NIGHT from the Episode portal
EXT. METRO HOTEL -NIGHT from episodelife.com
