root folder content example file (trees_pack_example.max) for you can see as you can mix textures and objects for get more randomization. File content all variations of trees with all variations of textures.
'trees_pack_models' folder content 36 random generated trees with leafs and some without leafs and also: 1 bush, 1 modelled separate palm, 1 modelled spruce. All models used .3ds and .obj format
'trees_pack_textures' folder content: 3 different textures with alpha in separate file for bush in 'bush' folder. 16 different textures of trunks for any tree (but not for bush, separate palm and spruce models) in .jpg format in 'trunks' folder. 9 different textures with alpha in separate file of leafs for any tree(1 for birch, 2 for cherry, 1 for cupress, 2 for maple, 2 for palm, 1 for small spruce) in .psd and .tga format and also textures for separate palm(palm1) and spruce models(blue spruce and green spruce) in 'leafs' folder.