I had few sets of Dust buildings. I decided to glue them and prepare to organize urban warfare during nearest battles. Three buildings I have made according to manual. These buildings were painted relatively fast&easy (gray and black sprays + flat clear varnish).
Other elements I used to create destroyed building which could play role of stronghold, objective, or just destroyed town hall in the center. I used gray and black sprays as the basis. Then lots of different pigments, including original ash. At the end black and brown washes. Finally I sprayed flat clear varnish to protect all colors and pigments on the building.
Below few photos of that building. Please, click on photo if you want to switch to other one.