Over the past few years, I’ve noticed that the variety and quality of aquarium decorations has really improved. When purchasing cat food and litter at the local mega pet store, I often stop in the fish section to take a look at their supplies. I’ve bought some very neat Mayan ruins, a few classical Greek structures, as well as Chinese pagodas for my Boxer Rebellion games. Good stuff, and well worth a look.
Here’s an article on using aquarium supplies as miniatures terrain.
MacPhee’s Miniature Men Blog has a tutorial on making rail fences for your 25mm 28mm wargames.
The Chicago Terrain Factory has a nice little article on building and casting a clay mold.
Small World Productions has a blog entry on building a coastal fort for your miniature wargames. It would be perfect for your pirate skirmish games. The result is a very nice looking piece of terrain.
The Ultrawerke Blog has a good tutorial on resin casting. That’s a useful skill to have when you want to make multiples of some part you’ve produced.
Remember. Casting some else’s work is stealing.