After some thinking, I realized that I don't even need the desktop icon "Macintosh HD" and it only distracts from my pretty desktops. Is there a way to hide that thing?
From here: http://forums.macosxhints.com/archive/i ... 61187.html Click the desktop, so that the Finder is the frontmost application. Go to the Finder menu, select Preferences, go to the General tab, uncheck Show these items on the Desktop: Hard disks.