Here is a first look at my foliage pack. Im new to modelling for source so it took me a while to figure out how to use "$alphatest" 1 instead of "$translucent" 1
Currently all I have is trees, Only one exported, with two out of the six skins set up. This set of tree's will have 5 base shapes and 6 skins each. Resulting in 30 different trees! Im starting modelling the other trees and shrubs now and will probably start exporting the remaining 5 trees, as well as setting up the skins later. Here a short video of the first tree and first two skins.
The trunk models have been subsurfed and are now using smooth shading instead of solid shading.
http://www.gamefront.com/files/20577501/trees.zip Download use the skin when creating the static prop in hammer, the first is autumn then the other are summer variants.