While I'd love some official art, I don't think it'd be possible to actually implement it into the game where it'd make sense. As The Djinn stated, champions need to clearly still be themselves, which they wouldn't be if they were genderswapped. Remember, in Lol, mostly every female champion has an hourglass figure, while mostly every male champion is built like a castle. Sure, some don't fit that description, but it'd no matter serve to have the champion's silluette change. Ontop of that, if you want a genderswapped version of any champion, wouldn't you want the champion to actually look female or male respectively? How'd you do that with FX. Garen? Just give him a different head? Then what's the point? If they had to implement this into the game, they wouldn't be able to actually go all the way because their silluette would have to be the same. Garena (super thought through name) would still have to be super bulky, covering her entire physique in armor. Sir Price (Miss Fortune gender swap) would not have the strut in his step, and his entire physique would be vastly different from miss fortune unless you specifically make his very sassy. I don't think actual genderswap skins would work, but I'd definately love some art of it.