Pijlie’s Wargames blog has a photo tutorial on making a hedgerow.
Modeling
Modeling 15mm Villages
Small World Productions has a photo essay on making a nice looking 15mm village.
Warhammer 40K Platform Terrain
Here’s a template for making what looks like either a launch platform or entrance to a chamber of some sort. At any rate, Warhammer 40K fans will find it useful.