Katerek, I guess you're referring to the houses, that have a different colored border/frame to make them look like buildings with flat roofs, that have a low encircling "wall" that surrounds the roof or terrace. I'm just using selections to create them. When I've done the outline, I'm just resizing the selection (making it smaller) and then just drop the lighter color into it. I'll add shadows to the darker, encircling sections in the end, to hopefully make it look more like roof terraces.
Now, there's another WIP update. There aren't many exciting changes in this one, but the ones that can be seen, were time-consuming nonetheless.
I finished the ruins (and am quite pleased with them, which might be the main reason for posting this update... ) and the walls surrounding some of the buildings. I'll finish the buildings next.