Then I am going to face a paint crisis, as the colour I have been using most recently for stone, seems to be no longer available at my local retailer, Blue. Dark by Crown, so I am going to have to scout around to see what there is. However as painting is not going to happen any time soon, it may all prove to be a bit academic.
Here is what I have at the moment.
I've put together a variety of combinations to show all the different permutations, although I still think there is a case to be made for some half length or smaller wall sections.