This is a set of twelve huge tree brushes, each around 2000 pixels, though they scale down wonderfully. They're semi-transparent with cartoon shading.
I made these for my own personal use, since rendering large trees in Poser takes ages. Rendered up a couple dozen, made them into brushes...now I can make entire forests with a few clicks instead of spending hours rendering.
Feel free to use these anywhere, in any way, just don't sell the brushes themselves.