Background uses absolute path to top-image (YELLOW).

Background uses relative image up 2 levels (YELLOW).

Background uses relative image up 2 then down 1 level (RED).

Background uses relative image up 1 level (RED).

Background uses relative image up 1 then down 1 level (GREEN).

Background uses relative image in the same directory (GREEN).

Background uses relative image down 1 directory (BLUE).

Background uses relative image down 2 directories (BLACK).