The Dark Future Games Blog has a tutorial on making sand bags from “green stuff” epoxy putty.
Modeling
Making A War Camp
Here’s a nice video on making war camp scatter terrain from junk.
Making Trenches Blog Series
The Roundwood’s World blog has a very nice series on making trench system terrain boards. I’m inspired.
Of Hills And Mountains
The Colonial Wargaming blog has a discussion and photos of various forms of tabletop hills and mountains, from the “rugged” to the “stepped” to the classic General Tremorden Rederring style profile mountains.
Sculpting Chains Out of Green Stuff Epoxy
Dark Future Games has an illustrated article on sculpting chains from Green Stuff Epoxy.