Ghost Bride Morgana
So this my last attempt at an argument to change the skin in any possible way, perhaps someone will see this. Hopefully this is a more measurable option.
Screenshot is directly from the game itself, noted and zoomed when her passive activates:
https://i.imgur.com/7kkyC7J.png
If it's as simple as a hue shift, like this here while her passive activates, I feel the colors in the skin would blend more and the wings would be less jarring. That's my two cents and I believe the last I have to give in my attempt to see changes in her skins.