Two more layers, progressively gentler each time. First layer, a sort of beigeish shade that B&Q's 'Colours' range calls 'Mary Jane' (really?) and I call 'beigeish'.
Second, that staple of decorators everywhere, 'Warm Magnolia'.
I should note for all of these I've been using a 2", cheap and cheerful, decorator's brush - nothing fancy. Also, again, these were taken under fluorescent light so the colour isn't quite what it looks like to the camera. It is, however, starting to look like rocks and somewhat sun-dried earth, which is what I was aiming for.