Write about what would happen to novel or fairytale characters if they existed in real life. Think about practical conventions that might surprise them. For example, Prince Charming (Sleeping Beauty) might balk at getting a job; Jo March (Little Women) isn’t an obvious candidate for make-up vlogger.
Rewrite an exciting episode from a favorite novel as a Ballad at least 30 lines long.
Write a story backwards. In other words, start with the conclusion, then explain what happened that led up to the action or event.