There is a whole new set of photoscanned objects from textures.com: grass. Taking as an example the 3D Scanned Grass Atlas 11 set, one can find multiple
tiff files that can be used in blender as image textures (those can be downloaded with a free account at low resolution):
Here is my node setup.
I don't know if it is right (node editor beginner here). And what should I do with the alpha map?
Obviously, there is something wrong with my setup.