I may come off as something of a flake, here, but I thought I'd spend a post writing about how I come up with story ideas.
I dream them. Yep. Much to my husband's annoyance, I go to bed at night and frequently wake up with a complete scene, (sometimes a complete story or novel) in my head. It will contain character names, settings, dialog. And why does it annoy the hubby? Because he dreams about teaching, paying bills, etc. When he comes up with a story idea, it takes a lot of work, planning, and outlining. Likely it produces a better story, in the end, since mine is often written by the seat of my pants, but I understand why it frustrates him.
Anyway, last night I dreamed a good portion of the plot for a science fiction/romance novel. Once I'm done working on my current project, I think I'll tackle that next.