Here’s a photo tutorial on making a terrain cloth. A well done cloth can really add something to your games.
modeling
Make A Gothic Water Tower
Iron Hands has a tutorial on making a watertower with a gothic look. It’d be perfect for Necromunda, Warhammer 40K or Warmachine.
Tools For Terrain Building
Here’s a useful article on the Top Ten Tools For Terrain Building. I learned something new here: that baking soda can be used as a superglue catalyst and filler.
Making Trench Systems
Iron Hands has an illustrated article on making trench systems for your 25mm – 28mm miniature wargames. The principal ingredients are concrete patch, rocks and fiberboard.