If you decide to give VrayPattern a shot, we have some basic stuff to get yougoing. Here is a patch of grass that we did a while ago that is perfectly suited to be used within VP. Opposed to other Mass-scattering engines Vray-Pattern works best with rectangular patches since it is based on UV-coordinates. Therefor here is something rather "square"!
To give you the best opportunity to explore the setup we included a complete sample scene along. It's sonething simple, but it also includes some settings concerning the randomization function you might like,
The scene is saved in Max 2010 and Vray 2.0 . That's it! Happy gardening ... btw, you should be able to render the testscene with the demo alright ...