Hello,i have do a tree and a rock, first the rock have normal maps and i have used Cube Projection to UV map it.The tree is very easy, for the leafs, i have used a plane and subdivided it.I used an bush texture and give it alpha in Gimp
Here is the blend: http://www.pasteall.org/blend/1450
I beleive you need to pack the textures.
http://www.pasteall.org/blend/1453
Very nice. Just a little much spec on grass and tree. But that is easily changed. Nice texturing.