http://cgcookie.com/course/creating-grass-in-blender  

Grass is just about everywhere outside, so it's really handy to know how to render it well. This course covers everything you'll need to make your own: modeling, shading, particle instancing, animation, and more! We'll cover two different ways of creating grass - hair particles and mesh particles. Since they both have their advantages and disadvantages, we'll cover why you would want to use one over another, or the best ways to use them in combination.

Duration ~ 1h
Video: MPEG4 Video (H264) 1920x1080

Chapter 1: Hair Grass
Use Blender’s hair particles to grow the first layer of grass.
Creating Grass Hair Particles 7 min
Shading Hair Grass 5 min

Chapter 2: Mesh Grass
Find out how to instance mesh objects using particles for a second layer of grass.
Modeling Mesh Grass 12 min
Shading Mesh Grass 8 min

Chapter 3: Adding Grass to a Scene
Put it all together with these last few lessons.
Combining Hair & Mesh Grass 4 min
Animating grass 10 min
Adding Extra Objects 6 min
Creating Dead Grass & Final Tweaks 4 min