At the latest SAC writing group meeting we discussed the nature of the story remix and thought it would make an interesting prompt and writing exercise. This is something anyone can do, and you can be as creative as you like with it.
Remixing is selecting and editing or combining and re-contextualising an already existing piece of writing. The idea is that you take a plot or concept from a book and re-write in your own style. It can be any book, and you can remix as much of it as you like: an entire plot, or a single character. What would you do differently? How would that change the tone, tension, or outcome of the book? The possibilities are endless, and the only real limitation is that you probably wouldn't be able to publish it—at least, not without getting express permission from the author or publisher of the original work—unless it's been released under a Creative Commons license (and even then it's always best to double-check).
But as a writing exercise, it can be a lot of fun and an interesting learning process for the author, inspire other people to read books they may not have otherwise tried, and invite readers to look at a text from an entirely different angle.