My friend made his own version of Snow White after watching Disney's Snow White (I have no opinion on it, since I haven't seen it myself).
And in his AU, he gender-bendered everyone.
I liked the concept so much that I ended up making a new AU out of it lol. My friend even offered to take the concept back, but hey, I hope he continues this universe.
I thought about the AU for a long time and decided to make Snow White in my own style.