Install Zukitwo GTK2/3 Theme With A Fixed Unity Panel Background [PPA]

Speaking of Zukitwo, as you probably know, the GTK2/3 theme is available in the WebUpd8 Themes PPA for quite some time (and is constantly updated).

Well, because the theme was especially designed to be used with a custom panel background (which you have to edit in GIMP) and because you can't use a custom panel background in Unity, I've enabled a tweak for Ubuntu 11.04 and 11.10 which makes the theme use a regular panel background by default (dark) so you don't have to tweak anything by yourself.