UPDATE:

I added additional files making the grass less greener or more greener. See the screenshots, they should clear things up :) .

========================================================
HINT:

Obviously it's best to activate these mods after MQ (with another mod you can continue playing) or solving the oasis quest in a certain way so it doesnt feel out of place...

========================================================


Replaces the tree leaves and billboard textures with red/brown textures to give the world a autumn look.

Also modifies grass textures, standard package comes with a slight degreenified (pretty word, yep) texture.

Greener Grass has more green than standard version.
No Green Grass has no green, all light brown/yellow textures.

By Bla232/Icewind.123, downloaded from fallout3nexus.com

=======================================================
1. Installation:

Install this tool made by Quarn, otherwise textures won't show up ingame and you don't really want to use the archiveinvalidation.txt-method.

http://www.fallout3nexus.com/downloads/file.php?id=944


2. Copy the "data" folder to your F3 main directory


3. Deinstallation:

Delete the textures, that's it.

======================================================
You have to use this with a tree-mod or you won't really see the new textures. Use either...

GreenWorld by Khyrin1129

http://www.fallout3nexus.com/downloads/file.php?id=2456

GreenWorld uses oasis trees, sadly they have no collision box and stuff.

OR GreenerWorld by MAK10Z

http://www.fallout3nexus.com/downloads/file.php?id=2525

GreenWorld uses trees with collision box.

=====================================================

I also recommend using Admiral Shlork's great Dirt mud and moss textures.

http://www.fallout3nexus.com/downloads/file.php?id=2572


Comparism screenshots for GreenWorld/Greener World included.


====================================================
Contact the author:
bla232 at tesnexus.com
Icewind.123 at bethsoft forums