Si is a great icon collection that gives you the possibility to quickly give a black and white effect to your desktop.To learn mode about changing your default Mac OS X icons you can access the Apple Support page HERE.
Here are some key features of "Si": Si collection includes the following icons: · Dashboard · textedit · ichat · photobooth · youtube player · renamer · icon composer · mail · firefox · finder · safari · itunes · xsystem · prefrence · 1password