Im new to actually trying to contribute something to all of this. I'm sorry if the formatting is incorrect
i put together a theme from taking parts from different places. The theme includes North American, European, and Japanese variant themes for Sega Mega Drive, Sega CD, Sega 32x, Super Nintendo, NES (only NA and JP), PC Engine, and PC Engine CD.
I did not make the themes, i just put them together.
https://www.dropbox.com/s/o2v3ur8xzr4qh5v/recalbox-multiregion.zip?dl=0 (link to dropbox download)
https://forum.recalbox.com/topic/3972/release-temporary-alternative-regional-recalbox-theme (link to original artist)