If you're still interested: There's a couple of cardboard terrain pieces available for download. The old wizard of the coast chainmail free-to-download building sets also contain ruined versions of most their buildings (ruined walls, towers, huts and even a ruined mausoleum). And with some luck you might even the old 5th ed GW sets (such as Grudge of Drong, Gravaine's Quest, Idol of Gork) for download. The German GW site had them uploaded some years back and, well, the internet never forgets.
Cheers,
Captn M.