Yes, a printer cartridge. I modelled it from just a box, and extruding the various bumps on it's surface. Each section was then assigned texture IDs so that multiple textures could be applied from one. (You can only apply one material to one object, so I had to make a material with multiple textures in it.) I'll get another render later to show the textures clearer.
(The current zoom is another reason I'll re-render it later)