I've been looking at the work of Keith Arnatt recently. He began as a conceptual artist who used photography as tool - he's famous for the piece where he wore a sign saying "I'm a real artist" and a series of images where he appears to be sinking into the ground.
Later he reinvented himself as a photographer working on various series including photos of notes his wife left for him around the house and a series of photos of objects found on the dump (one of which is pictured above).
I'm a Real Photographer: Photographs by Keith Arnatt