A fair few years ago I was browsing mods for Skyrim and cam across one which added Rainbow Dash to the game. The cover picture was
this image (which was clickbait if anyone was wondering) and I have, to this day, not been able to find the source. It has obviously been edited by the mod author but they were of no help and didn’t seem to care at all about the comments and such.
(I don’t know if I should link the actual mod page or not so ask and ye shall receive.)