A group-created campaign.
1st Session was group design.
All players made game pitches for a campaign to play. Three settings were identified; selected was Sky Frontiers. A world that discovered how to build air ships and then discovered that high over the land were floating islands. This allowed the people to explore a new, distant land and explore upwards as well.
A dozen game plots were suggested, and chosen was: As the people reached into new territory they found new, mysterious powers, some of them of dark intent.
After that, take a look at your wiki. There is some more helpful info there.