How To: Change Mac Icons
Nothing says “Hands off! This is MY Mac” like a highly customized desktop.
Once you’ve chosen a Icon Set (or six,) unpack them to a folder on the desktop.
Right click then Get Info on the new Icon. At the top will be a picture of the Icon, highlight this then use to copy the Icon to your clipboard.
Go back to the folder you’d like to change, IE, your hard drive’s Icon. Right click on it, the go to Get Info. Highlight the Icon at the top, but use this time.
Close the Get Info window, and the Icon should change!