My additions to the amazing app.icns icon library: http://appicns.com/
Just clone the repo, and off you go! If you need more installations info you can read my article here:
http://robandlauren.com/2013/01/11/custom-icons-in-mountain-lion-retina/
Special thanks to Lauren Gray and Jamie Wright for their awesome icon additions!
Hammer used in the Xcode icon designed by John Caserta from The Noun Project.
Key used in the 1Password icon designed by P.J. Onori from his Iconic repo.