Terrain Thralls has an illustrated tutorial on making an impressive Skull Cave terrain feature.
modeling
Making Wargames Terrain From Christmas Villages
I have often looked at those cheap Christmas village buildings and thought that they would be great for tabletop wargaming — if only they didn’t have those piles of molded snow and Christmas decorations. Here’s an article about converting one of those pieces.
The solution to the snow piles is a head slapper: convert them to patches of moss with foam turf.
Making Wire Trees
The DC 2150 Blog has an entry on making wire trees.
Making Bayonets
Carmens’ Fun Painty Time Blog has a tutorial on making bayonets for your miniatures
Turning Christmas Village Buildings Into Wargames Scenery
Iron Hands has an article on turning those cheap and ubiquitous porcelain “Christmas Village” buildings into Mordhiem scenery. The results are very good.