Adding something as simple as instanced grass geometry to a scene will give the end result a much richer look, however you have be careful to not have it look too computer generated. With that in mind, The Render Blog and João demonstrates the basic technique for creating grass, quick and dirty using V-Ray Fur, João from shows how to get a great base going for your grass quickly.
This is very usefull when you need a quick solution that doesn’t look too “CG” and can give your scene a more natural look
João shows how to create grass quickly, getting a good base to work from using VRayFur, and also briefly describes some tips for rendering and getting a base material using the VRayMtl shader. Check out the tutorial for Creating Realistic Grass with VRayFur here.