I've been toying with a new way of writing campaign ideas down that is fun and idiosyncratic.
Start with the name of a god or faction, and describe its members. Then name how they are troubled by another group in a way that lets you flow into the next paragraph.
So, for example:
The Faction, who are a shifty group of people that terrible at coming up with names. They are insanely jealous of ...
The Appellomancers, wizards who have the power to rename things and transform the thing at a fundamental level. They are in an intellectual feud with...
...and so on. if you have a neat quirk or characteristic that didn't fit this format, add it as a footnote to your document.
I did an extended brainstorming session in this fashion, and found that it does a great job of getting you into a creative flow, and forces the creation of a more cohesive world.
My first experimental setting created in this manner I call The Far Horizon: an arctic tundra and mountain range that has recently been flooded by settlers and refugees.
Here's what I came up with on my first attempt at using this method: