What is the Third Choice universe? What if at the end of The Cutie Re-Mark, what if one of them stayed behind to be the friend Starlight lost? Star Note née Starlight Glimmer stayed with an eye towards defeating Twilight Sparkle, only to change her mind. Twilight returned to a world where she is the Princess of Magic, and has been friends with Starlight Glimmer, the Princess of Friendship, since school. A place where Luna revealed her true form before advocating, where Sunset returned in a ball of fire. I may someday finish the story, although I'm not against bringing on a ghost writer for the project.
Any how, the awesome Cloud-Fly on DeviantArt is guilty of drawing this.