io9 has a regular feature they call Concept Art Writing Prompts. They post a piece of art and invite readers to submit stories based upon the illustration. I've started writing short—often aiming for very, very short—stories as a warm-up to my real writing.
This one was based on a piece by Eric Joyner.
"Look, we don't get it either. But you've been part of the group discussions, and you agreed with the rest of us: there's no way we're going to be able conquer the human decisively until we begin to understand them and we have to start somewhere."