Remove Ubuntu Logo in upperleft hand corner of Gnome Classic

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http://askubuntu.com – I really want to customize the bar at the top of ubuntu. My first "problem" is that I can't figure out how to change the logo in the upper left hand corner. Any ideas? EDIT: I'm trying to change it to something else, just because I want it to not have any sign of Ubuntu at first look at my desktop. (HowTos)