Maiwand Day blog has another tutorial on making a rocky hill out of wood chips. It’s wonderfully effective.
Modeling
Making Smoke Markers
Take the High Ground has a photo tutorial on making some impressive looking smoke markers.
Modeling With Birch Tree Seed Pods
Game designer and gamer extraordinaire John Hill (Squad Leader, Johnny Reb) once told me that “nature recreates itself in miniature” in response to a request for advice on terrain building. This advice for modeling with Birch Tree Seed Pods is a great example.
Scratch Built Shanty Buildings
Here’s a page with some good photos and nice advice on making shanty buildings.