Recently I came across a simple but cool little app called ngplant designer, an L-system implementation that is programmed specifically to generate 3D trees and plants.
The app is simple enough and it doesn't take a rocket scientist to figure it out. Just spend a few minutes with it and you'll be churning out trees in record time.
The resulting mesh can be exported as an OBJ file to be imported to the 3D app of your choice. The UVs are readily laid out so all you have to do is slap on the texture images with some minor tweaks to further tailor it to your heart's content. While it is perfectly capable of modeling leaves as well, it does slow down dramatically when you reach a certain level of branching, yet the leaves density is still not quite there yet. So I imported the mesh and used the branchs' vertices to clone cardboard leaves , duplicating to achieve the desired density.
The trees above took around 10 minutes each from ngplant to rendering in Lightwave3D, complete with textures and leaves
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