This is a set of cartoon mushrooms and grass set into groups for use with particle systems.
On the first layer I set up a small scene with particle systems (one for the mushrooms and one for the grass). On the last two layers you can find the groups.
The materials use only procedural textures.
You can see a short video here:
http://www.youtube.com/watch?v=TJ85ku1kfjo
Good Cartoon Quality. Looks like a pro stuff. well done !