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.
modeling
Sculpting Chains Out of Green Stuff Epoxy
Dark Future Games has an illustrated article on sculpting chains from Green Stuff Epoxy.
Modeling Bushes For Your Wargames Table
Here’s a good instructional video on making good looking bushes for your wargames table.
Making 15mm Trenches
Itty Bitty Battlefields has a post on making 15mm trench systems on the cheap.
Constructing A Native Village Tutorial
The Wargame Terrain blog has a nice tutorial on making a thatched hut native village.