Many projects related to Ubuntu are using the Tango icon guidelines: GNOME, Gimp, F-spot, OpenOffice, Firefox 3... just to name a few.
Currently Ubuntu's default icon theme is Human, which in turn is not based on the Tango Guidelines. This means that applications are not integrated into the lock and feel of the whole system as well as they could. Also, Human is not 100% complete, so it still uses some Tangoish icons from GNOME. This leads to a mix of Human, Tango and Old-GNOME look.
Ubuntu should provide a minimal Tango-based theme which just replaces some of the very visible icons, like folders for example. For the rest, either the GNOME or Tango icon theme can be used as a fallback. This way, Ubuntu would keep a special branding but very much improve the overall visual consistency of the OS.
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