Mountain Lion Dark Menu is a beautiful theme that allows you to give a stylish, dark look to your Mac OS X Mountain Lion menu.
To install the Mountain Lion Dark Menu theme you must copy the files included in the package to specific locations. Remember to backup the original files in case the new theme does not suite your needs.
Place the SArtFile.bin file in the /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/Resources/ folder and then log out. The next time you log in you will be able to see the difference.