>>18397730>(red/blue US, blue JP) Just to correct you, it's Red/Green JP, Red/Blue US/Blue JP and Yellow JP/US
You see, games released as Red and Blue in US are in reality Blue JP. Red/Green JP were never released outside of Japan.
To answer your question, I've seen some arts like this on this blog
http://fuckyeahbetapokemonart.tumblr.com/ I also I have a few humorous arts based on their backsprites.