The Tobi’s Paint Pot blog has a photo tutorial on making an awesome canvas and acrylic flexible gaming mat. I’m going to make one.
Modeling
Building A Wooden Stockade
Here’s a photo story on making a wooden stockade from bamboo skewers.
Making Camouflage Netting In 15mm
The Empire of Ghosts blog has a tutorial on making 15mm camouflage netting.
Making A Stone Wall And Metal Fence Terrain Piece
Here’s a how-to for making a nice stone wall and metal fence terrain piece.
Making 28mm Corn Plants
Here is a terrific tutorial on making corn (maize) plants for your 28mm wargames. These are by far the best I’ve seen.