When I decide to sit down and actually write1 a story then I could use my dreams as a great starting source. They tend to have some interesting twists and conflicts and are fairly detailed. I would just need to write down an outline as soon as I wake up. The rest of the story, the before, how, and after, could be extrapolated from there.
Last night's dream was interesting, but I don't remember it anymore.
1 And, ya know, actually put to good use the dozens of writing panels and sessions I've attended.