Dust of the ages
This is the radiator in the bathroom we're re-doing. We've been slowly chipping (by hand) the (many) layers of paint off, and here's it's covered in plaster and wood dust from the demolition. It's a wonderful old radiator, and is just about the only part of the room that we're preserving, although it'll be a pain for the various builders to work around :-).
I used HDR to help manage the contrast changes.