Inside the dishwasher
Canon 350D with Sigma f4 8mm fisheye lens was placed into the dishwasher's top rack, pointing down, wedged into the dish rack.
My Canon 580EX flash was also put onto the top shelf on the other side, tilted up to point at the reflective steel ceiling. It was triggered remotely via Cactus V2 radio triggers.
The lens was set to f22 to get the broadest depth of field.
I put the camera on 10 second timer and closed the door. The flash fired, reflecting all around the inside and providing quite even lighting!