Do not search for brushes.
Search for tutorials on how to make brushes.
And multicolouring, and blending tutorials.

www.pixel2life.com/ Should help
http://browse.deviantart.com/resources/tut...rder=5&limit=24
Deviant art will help lots also, don't use tutorials that tell you "How to make this image"

Find tutorials that explain methods and techniques.

THere's nothing else to say on the sig, most of it has been said ^_^