@Vagabond: Yep, I gave the verandah roof the same burnt umber wash as the thatch. I did start to dry-brush the fences a bit more, but wasn't happy with the effect, so for the moment most of my fences stay in the original colours (though I might have put some black wash in the gaps between the planks when I first got them - I can't recall exactly).
@Mad Gadgeteer: No, I hadn't heard of those books. I will check them out.