I looked at a few abandoned houses, picked an angle I liked and started drawing an old run down house from several photos online. This seems to be the process that works best for me. Often I'll have a loose idea in my head of what I want to draw, so I'll look for reference photos of the real world subject. Then I'll search google images for the emotive or visual qualities I want. Often by doing this I'll stumble across something visually apealing even though the subject is completely unrelated. Thus "Original" artwork is born.