This is indeed a great start Slin, this is looking quite promising !!
But for not being an artist, this still looks good
Keep on improving this and especially the LOD factor but I wouldn't see the advantage of adding a shader to all of this. It will look indeed better in detail in a "relativly illusionist way" if you add those shaders but the framerate will decrease due to the faqt that this is a generator used to generate alot of things, which here could be like 100++ trees.
Just my point of view, in overal I can't wait to see this finished

Cheers

Frazzle