Grass look is highly configurable, handles directional and spherical wind zones & proper intersections with other objects. You can make your own textures easily using the built-in editor. For the full feature, the guide refers to the forum thread.

Package requires GPU with SM3.0. Mobile versions are on the roadmap (while shader works quite fast on current desktops). Unity4.5+ is highly recommended for shorter install time.

Check out the details from the Unity Asset Store: https://assetstore.unity.com/packages/tools/particles-effects/volumegrass-436

Now download VolumeGrass Free Unity