Origin stories are often cliche, and I'll admit that. Especially when they're just a pretty little way to explain away why a villain does this and a villain does that. It's just I always felt like Chrysalis needed one, so I gave in and created one for her.
This tells the story of Crystal Chalice, a young filly without a cutie mark seeking love from the other fillies and colts who bully her for her blank flank. Day in and day out they treated her horribly, until the offered her a way in, a way to be loved by them as much as she loved them.
But... Things didn't quite go the way those bullies expected.