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The piece in the pic looks pretty simple and looks like something I could make pretty easily to start off making terrain.

What foam should I use and how do you add the color and texture to the top?

Where can I get the bricks and whatnot to make the rubble?

Looks like good old pink board insulation, textured with sand. Bricks could be done with pieces of cut up sprue.

The area the ruins stand on is probably hardboard or MDF. The ruins themselves are from the old Ultramarines vs Tyranids starting pack.

flock with cork dust, not sand for terrain pieces. sand is abrasive. cork dust can be bought cheap as it is sold to folk who go fishing.

for rubble. cut up sprue, broken up cork, plasticard, small stones.

some WIP shots of flocking
http://iron-legion.blogspot.co.uk/2015/05/246-cork-tor-hill.html