The Dark Future Games Blog has a tutorial on making sand bags from “green stuff” epoxy putty.
Last Stand – The First Battle of Thermopylae (480 BC) Rules and Figures
Last Stand – The First Battle of Thermopylae (480 BC) is a set of free wargames rules and figures for the classic last stand of the Spartans against the Persians.
Making A War Camp
Here’s a nice video on making war camp scatter terrain from junk.