Daniel gave me the heads up on this great Flickr pool - The Noise and Dust Through the Viewfinder. It is, as you would guess, a collection of images of the dust, scratches and textures that can be found on old analog cameras. Aside from being strangely beautiful creations in and of themselves, they could easily double as potential textures for other means. I'm particularly fond of these that have the triangular holding pins visible and, often, a reference grid as well. So good.