Found a new way of doing my bases for figures that I wanted to set in an urban war zone. Instead of buying packages of overpriced bricks and rubble, none of which matched the actual buildings I was using, I first made a simple mold, using a product called smooth-on, before assembling the buildings, then poured a diluted thin layer of hydro-stone into those molds. By mixing about twice the amount of water with the hydro stone powder as the directions call for, I got pieces that easily broke into ruined fragments that I could use both on bases as well as around the completed buildings. Then I primed those pieces with either a dark brown or black rust-ol-leum primer as shown in the photo below.
This gave me a pretty much infinite supply of brick & stone wall sections in any size I wanted, broken window sashs, wood floors, columns, tree stumps etc.. Then I could simply select the pieces I wanted to incorporate onto my figures bases.
Bricks were then highlighted with GW red gore very lightly, stone with any old gray paint I had handy and a wash of MIG industrial city dirt was applied. The wood sash simply had just the Mig wash applied right over the dk. brown primer.