It turns out that Hot Glue is not only useful as an adhesive, it also has modeling applications. This video shows how to use hot glue to model flames.
Modeling
Making Stylized Wargames Hills
Here’s a good video tutorial on making the sort of terraced wargames hills which are not particularly realistic, but which are eminently practical from a gaming perspective.
Working With Mantic’s 20th Century Red Brick Terrain
For their Mars Attacks game, Mantic released sets of 20th century style brick ruins. They’re good looking, but with a little work can be even better.
Making Hedges With Plasticard and Clump Foliage
Here’s another tutorial on making hedges — useful for lots of different settings.
Making Ruined Roads from Vinyl/Lino Tiles
The Tabletop Terrain blog has a useful article on using vinyl/linoleum tiles to make roads appropriate for a combat zone or post-apocalypse setting.