Painting Tutorial: Grass

Many people liked my grass in my latest wall "Through Golden Fields" [link] and boggled me with questions on how the hell I made it. XD So here is the tutorial they requested!

Feel free to ask me anything for clarification. ^_^

Once you read this through, and/or manage to make something, reward yourself with a cookie! (who doesn't like cookies?)
If you do happen to make something, I would like to see your work!