Only type I haven't seen you do is a lava sea world like the old Infdev Hell world type. It would be cool to see it brought into a more modern realistic style! I'm picturing black beaches, obsidian and basalt volcanos, and flora/fauna only being able to live on the higher elevation regions of the landmasses, away from the heat of the oceans, creating an unforgiving environment with sparse oases of green to survive in. Would make for a hell of a survival world challenge too!
