http://img212.imageshack.us/img212/416/rmmountains0000vw4.jpg
( Fuck that just click the link I don't remember the code to put the image in the message )
Well that should explain you what is the problem, but in case:
There is certainly something missing between the step where u decompile the tree texture and when u change the texture. Even if I wouldn't have put the leaves purple it does the same problem.