In this video, the Terrain Tutor demonstrates how to model some very nice wood fences.
Modeling
Modeling A Teepee
Here’s a short photo tutorial on modeling a teepee.
Texturing Gaming Board With Spackle
This video shows a nice technique for texturing game boards with filler (spackle).
Making Scale Model Rubble
Skankgame has a good article on making scale model rubble for your miniature wargames.