The League of Ordinary Gamers has a quick and easy idea for making some good looking 15mm barbed wire.
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The Lights Are Going Out is a set of free wargames rules for WWI in 1914. The rules are designed for 15mm figures.
18 Charlie has a tutorial on making 15mm palm trees. The methods looks good, and should be quick and inexpensive.
Gladius and Pilum is a set of free wargames rules for battles set in the 500BC to 500AD era. They're designed for 15mm miniatures, with one figure equaling 50 men.
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.