Iron Hands has a nice illustrated article on his efforts to create a river for a Mordheim tabletop. It’s really neat looking, with a detail density that’s only found in the best of the Games Workshop illustrations.
Ironhands has a tutorial on building a Games Workshop type Thunderhawk gunship from styrene and bits of toys. It’s a nice and imaginative scratchbuilding project.
Ironhands has a page with tips for creating sufficiently alien Eldar terrain for your Warhammer 40K games.
Given all of the Zombie gaming going on these days, there’s bound to be a demand for models of wrecked cars. Terragenesis has an article on making casts of car wreckage in plaster.
At A Year of Frugal Gaming Blog, the author has an illustrated article on his efforts to create a silicon mold to allow him to replicate various architectural parts for terrain making.