Captain Richard has a nice photo tutorial on making realistic looking brick walls from paper. Teh key is torn and overlapping prints of brick texture paper.
Making Large Removable Canopy Stands Of Trees
For areas of particularly dense forests, creating large tree bases with removable canopies allows you to properly hide your figures.
Making A Desert / Wasteland Terrain Cloth
The 1000 Foot General has a tutorial on making a desert / wasteland terrain cloth.
Painting Reaper Bones Skeletons
The 1000 Foot General has a photo tutorial on painting skeletons from Reaper’s Bones line.