Too tired to paint minis tonight, but not to make some easy terrain in front if the tv.
Cork ruins are easily the quickest, best looking concrete ruins I have scratch built so far...
The cork tile is superior to foam core for the following reasons:
The edges don't rip if your knife blunts
Already has a texture
Edges look good when broken up
Takes Superglue. No drying, no melting.
Relatively heavy and stable
Soft and grippy on the underside.
My City ruins board is looking much further along now than last week!