Dramatic Katastases has a nice, if brief, post on making stands of trees. I think I’m going to convert a few of the trees I have on washers over to this setup. They will be more stable and add a little something to the table.
trees
Making Model Trees
Here are some instructions from an old model railroad magazine on making model trees.
Making Heavy Foliage Scenery
The Corbania Prime Blog has a nice illustrated tutorial on making heavy — jungle — foliage terrain pieces.
Making Jungle Trees
The Wargame Terrain Blog has a photo tutorial on making jungle terrain.