rivers
Making Tabletop Rivers
The LudStuff blog has a nice essay with photos on making tabletop rivers.
Rivers For Your Wargames
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.
Advice on Modeling Rivers
Tim Marshall has some advice on modeling rivers and other bodies of water. There are some very good ideas here.