Been having a really intense craving recently to play in the Eberron Campaign setting.
Alternatively, I've been thinking about an advanced society that survived some sort of apocalypse and have lived in a force-dome city for centuries now. The dome has failed, allowing people to explore the new world. Numerous small elemental airships are sent force to, of which the adventures follow a small group?
I doubt I can GM such a game, though I can possibly co-GM.