Earth Magic; Scott Cunningham

When you draw a heart in the sand, call on the four winds for assistance, or ask the rain to wash away a bad habit, you are practicing earth magic. By working in harmony with nature, we can transform ourselves, our lives, and our world.
Earth Power: Techniques of Natural Magic by: Scott Cunningham
http://www.llewellyn.com/bookstore/book.php?pn=L131
You will see a lot of similar works, I have used his book
Earth, Air, Fire & Water: More Techniques of Natural Magic.
I find a lot of inspiration's in his writings, so follow the links to get your copy as well.