The last few weeks I've been constructing forest terrain as shown in the "Architect's of War" How-To site. These are sized for 15mm miniatures using 2 1/2" roofing nails. Basic process is cutting the the top and bottom templates, spreading caulk on the ground template, securing the nails, adding sand/grit/pebbles and allowing to dry. Build the canopy template next by hot gluing Woodland Scenics "clumps" to the black foamboard. Then I lightly spray the clumps with 3M spray adhesive and sprinkle on a little flocking. Going back to the now dry ground template I paint with dark to light shades of brown followed by dark gray over the "tree trunks" and a light gray drybrush over the rocks and trunks. Done.