This is a scene used in a film I made called "Theevan". I created this scene using:
ANT Landscape Generator
Sapling Tree Add-On
Particle System for grass, trees, rocks and leaves.
Most of the materials are standard blender materials except the ground. The ground texture not included as it was downloaded from CG Textures.com. Any seamless mud texture will do with a bit of bump mapping.
Feel free to use, modify, etc for your works!
Here is the video that contains this scene: (starts at @4:02mins)