These pieces could be used in any era for mountain warfare and whatnot. I've had Italy in mind, for the early 1809 campaign and perhaps the revolutionary wars?
They are made from pieces of bark, and the bases are old DVDs. Actually, a small centipede just crawled out of the first one while I was adding grass to the base.
As with the farm, I started with a dark brown basecoat and three or four layers of drybrush, with a more orange tone on the first one, and matching colors for the rest.