What Yankee said, also go watch a TV show, movie, read a book, or just browse random art and music until you get an idea.
-Heck do [i]something[/i] you'll enjoy and then write based on what you know.

Bounce said ideas off a friend until something just [i]screams[/i] that it must be done.

I tend to take the demonic blender approach by combining multiple trope pairings into a single fluidly dynamic story with complicated motives and a broken moral compass in a world without any maps.... which actually sounds cooler than it should.