There is a wonderful series of the spaces where authors create in the Guardian online. Great links to photos and articles about the authors published over the years. A few mystery authors are sprinkled among the group. Also included are comments from the writers about their rooms. You'll love them all.
Photo above is of Ian Rankin's writing room (from May 2007/have things changed?) For pure clutter, go to Russell Hoban's room. Great writing comes out of great chaos. My kind of room.