Here is a tutorial to make grass in Blender.
Blender is an open source free 3D modeling, rendering, and post-production tool. Go to www.blender.org for more details.
Not for complete newbies.

Once you have got blender open, you'll need to make a plane (Space-Add-Mesh-Plane). Push tab to goto object mode and push s and scale the plane up to a reasonable size.

Go to the materials buttons and make your plane green.

Now you have your ground, go to the physics buttons (Object Buttons --> Physics buttons). Make sure you have the plane selected and click NEW in the particles panel. Now make the options as shown in the image attached.

Now position the camera and Render. It will be pretty simple grass, adding a texture will make it better.

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