SwatSnipe you might be able to use this plugin without having to seperate and combine, I just did a little test and the spread looks good to me, to use just delete history of the mess then with the...

SwatSnipe I think I found a better (faster) script to do the 4 leaf UV layout, its called "djPFXUVs.py" see link below...............dave

http://www.djx.com.au/blog/downloads/

Looks good but the tree`s are at a angle that does not look real...........dave

Not sure if bokeh lens is mental ray only..............dave

You can use the camera DOF it does work with maya render............dave

Yes that does look better seams to blend in better................dave

Nice job, I dont think your displacement is working try changing the alpha offset in the file node.............dave