Recently I have written a relatively small document for a Pathfinder campaign setting. The general idea behind the world was a planet where the outer layer of earth has been removed from the inner portion. This outer layer has broken up into large chunks of land that drift in the sky, each housing its own unique small ecosystem and culture. The core of the planet has become an arid wasteland. Fading magic, unstable machinery, greed-driven merchants, and destructive cults await adventurers who set foot in this world.
Here is a link to the document. If you have any feedback, please leave it here. Though this is just general information about the world, it could be elaborated on further.