I sort-of do this already - with the online group Whartson Hall, since we publish our recordings, I pick a (royalty-free) theme for each game. But that's usually just a matter of setting a general mood.
For Hurricane Season (Monster Hunters in Weird Florida), whlie I'm not recording it, I ended up doing the same thing:
https://www.youtube.com/watch?v=Yy-NyPTRYU8