This post is on modeling a 54mm briadge, but the techniques could be used for any scale.
Modeling
Making Garden Patches
The I See Lead People blog has a photo tutorial on making a garden patch.
Making A Ruined Building
Here’s a photo tutorial on making a ruined building. It’s intended for Mordheim, but the technique are universal.
Making Plowed Fields Terrain
Here’s a photo tutorial on making some very effective plowed fields terrain for your wargames tabletop.
Building A Red Planet Terrain Board
Here’s a nice photo essay on building a red planet terrain board.