Small World Productions has a photo essay on making a nice looking 15mm village.
15mm
Making 15mm Barbed Wire
The League of Ordinary Gamers has a quick and easy idea for making some good looking 15mm barbed wire.
The Lights Are Going out WWI Rules
The Lights Are Going Out is a set of free wargames rules for WWI in 1914. The rules are designed for 15mm figures.
15mm Palm Tree Tutorial
18 Charlie has a tutorial on making 15mm palm trees. The methods looks good, and should be quick and inexpensive.
Modeling 15mm Wheat Fields
Here’s a tutorial on modeling 15mm wheatfields for your wargames terrain collection.
The key ingredient in this project are door mats made of coconut matting, called coir matting.