Me and a musician friend decided to practice a bit with an upcoming Ludum Dare Jam, and we thought we should make a mockup and music that goes with it. Three of four words given by a random noun generator were 'Mechanic, clock, tower', interestingly in that exact order. So, that's the general direction we went.
Obviously unpolished, but I mainly focused on the big picture since I would have time mostly for the big picture, not small details. I would be nice if I worked fast enough to draw gears quickly though. I also worked with a different perspective than a plain side-view.