Dark Future gaming has a post on using bits of foam to weather a 40K vehicle. The technique could be applied to almost anything, though.
modeling
Making Heavy Foliage Scenery
The Corbania Prime Blog has a nice illustrated tutorial on making heavy — jungle — foliage terrain pieces.
Tray Fillers
The Wargames Table blog has a good idea for filling in the blank spots on a movement tray.
Basing Miniatures Tutorial
The Land of Counterpane blog has a nice piece on basing figures. We all have our methods, but it’s nice to see how others do it.
Making Jungle Trees
The Wargame Terrain Blog has a photo tutorial on making jungle terrain.