To me, that looks like Wills coarse stone (
link) for the bricks, and pollyfilla or similar (
link) for the adobe.
The main structure (the blank which you dress, if you will) is likely to be foamcore or cork tile.
Of course, there are a
lot of ways that you can do something similar.
For example, embossed styrene sheets for the brickwork are usually cheaper and easier to work with. Or, if you are using a foamcore base, you can peel off some of the outer "skin" of card and emboss the core with an old pencil. Or, you can use a product likefoamed pvc (
link) for the building, and emboss the surface directly with a pencil.