Thanks O_B I'll post some of my grass and tree models there when I finalise them.
Another thing that may be helpful are some "template" TGDs for certain objects. To give an example, I use Bantam 3D grass to create different grass models. Rather than resurface each model I just open up a TGD with an old model and then replace the OBJ import. Arbaro also outputs standard groups (trunk, stems and leaves) which would benefit from such a template.