Here’s a nice tutorial on making insulation board hills for your wargaming table.
Modeling
Sculpting A Chain Out Of “Brownstuff” Epoxy
The Excommunicate Traitors blog has a photo tutorial on making a chain out of the brownstuff epoxy putty.
Building A Cardboard Hill
Hills are among the most basic sort of terrain you need for a wargames table. Here’s some nice advice on building inexpensive cardboard hills.
Build A Cheap and Quick Wargames Table
Here’s some good advice on quickly building a relatively inexpensive wargames table.
Making A Skull Cave
Terrain Thralls has an illustrated tutorial on making an impressive Skull Cave terrain feature.