I picked up a couple of pieces of area terrain from eBay recently. They're pretty basic - vaguely oval resin bases with a few rocks and some ground texture. The sort of thing I think I should be able to make in an afternoon with a few bits of MDF and some sand. Except I've not really been able to do it convincingly or robustly.
The two outcrop bases cost me less than £14 (eBay seller: dands-gaming) and took less than an hour to paint. I simply sprayed them with a stone colour over the undercoat, daubed some yellows and greys onto the rocks and added some washes on the ground. Everything was given a bone drybrush and then I added some tufts.