Low-poly tree creator

I've been searching for a low-poly tree creation program, but have not found one that would be impressive in any way. I did a search on this forum and found a thread from 2004. There Treemagik was suggested, but I was not able to make it run under Windows 7. I'm specially interested in obtaining pines and spruces and I would also like to get different detail levels easily. A free program or perhaps blender plugin would be the best, but a reasonably priced commercial program would also do.

Maybe making a procedural tree generator for specific tree types would not be too hard to make, but I'm not sure that I want to invest time on that, if there exist good programs already.