I've seen a few of these about in recent weeks, and thought I'd have a crack at making my own. Its based on corrugated cardboard PVA glued onto another mdf coaster, and a bunch of routine flock/sand/dirt effects added. Overall it ended up looking far more overgrown than I had intended, but it fits the bill for what I was after. The next one might be a bit better tendered by Farmer Maggot & friends though.
Here it all comes together as a small Saxon hamlet, comprising of all my recent terrain additions, some low stone walls and the hovels I made awhile ago.