When a battle gets out of hoof, Equestria turns black and white. This affects the ponies as well, tuning them to greyscale. Well, most of them. Somehow Fluttershy, Rainbow Dash, Applejack, Pinkie Pie, Rarity, Discord and the four Alicorns are still in full colour, well, kinda.

Note: this story is not and never will be rated M. Pony Shades of Grey is simply referring to the colour of Equestria in this fic, nothing else.