This GoPro time-lapse pan controller helps add an extra dynamic to time-lapse photos, by slowly panning during the shots.
Here's an Arduino painting machine. It's an Arduino Due hooked up to a Samsung Galaxy Note tablet, and it's a pretty impressive project.
Zcapture is a hardware and software solution to create 3D images of products. It is based around a rotating platter, and your DSLR camera.