I have a couple of trees available in Bryce freestuff(shameless self-promotion) and there will be more available soon. I started making trees because I found the treelab to be a major pain in the butt. As for using the PS made texture,.....click on the "P" button under the texture in the material editor and on the top right button,....you will get the procedural texture panel, then click on "Load" and locate the texture you want to use.

"Any club that would have me as a member is probably not worth joining" -Groucho Marx