There was a guy in our group who constructed an entire forest out of nails and sponges. It seemed like a good idea until one of the players leaned over the table and his hand came down on one of the trees.
Still, if you’re brave enough, here’s how to do it.
Kings Minis has a nice article on how to make your own foam foliage. My wife is doing upholstery on the kitchen chairs, and the’s likely to be surplus of foam. I can’t wait!
Here’s a photo tutorial on basing tree armatures.
The Daddy’s Little Men Blog has a brief article on his experience trying to make an orange grove for a game set in southern Lebanon.
The I See Lead People Blog has a photo tutorial on modeling the distinctive Birch Tree.