Here’s a video with nice techniques for making a base with overgrown debris. The techniques also would come in use for modeling the floor of large terrain bases, such as tree stands.
The Miniature Wargaming Editor
Warhammer Colonials!
These aren’t exactly free wargames rules, but if you already own a set of Warhammer 40K, this is worth checking out. Jervis Johnson has provided this page of colonial amendments to Warhammer 40K. These also would be a good way to introduce fantasy and science fiction wargamers to historical miniatures games.
Free English Civil War Flags
This 28mm Life offers a large collection of free print-and-play flags from the English Civil War.
Nelson’s Wars Napoleonic Naval Rules
Nelson’s Wars is a set of free wargames rules for naval games in the age of Napoleon.
Painting Tiger Stripe Camouflage
Here’s a nice tutorial on painting tiger stripe camouflage.