Created almost 25 Tree Textures used Blender 2.72b, 1000x1000 - Image, Alpha Map, Normal Map included in this file. Material is set, ready to use for cycle render.
Vol II - http://www.blendswap.com/blends/view/81369
Vol III - http://www.blendswap.com/blends/view/81478
This tree texture pack has been very useful. The only problem: the faces are not always the right direction. To fix that, I duplicated the rectangles and made them criss-cross. That way, one tree looks somewhat more three-dimensional.
You can see my castle render using your trees on my website, if you want.
You can use Rotate these face by adjusting particle system "rotate" command!! I checked your work! that is good!
wow this is really good!