The 1000 Foot General has a series of articles on making terrain boards.
Modeling
Model Railroad Layout Based On Lovecraft’s Arkham
The Miskatonic Railroad is an HO scale model train layout based on HP Lovecraft’s Arkham in 1908. It is absolutely gorgeous to look at.
Making and Using Silicon Molds
Here’s an instructive video on making and using simple silicon molds.
Desert Mesa Modeling
How to make a Desert Mesa for your miniature wargames.