Spend a lot of time building a non-brown theme whenever you install Ubuntu? There’s a little-known theme called Blubuntu easily installable from the Ubuntu repositories that can switch every aspect of your desktop to blue.
The goal of Blubuntu is to offer a polished and cohesive alternative to Ubuntu’s default theme. Install the theme’s metapackage to install all the Blubuntu components, including the GTK widgets, Metacity, and GDM login screen themes. Click here to install blubuntu, or run this command: