Greybird, the default theme of Xubuntu has been completely revamped. The theme now fully supports Unity and Gnome Shell as well.
Greybird theme includes:
- GTK2 theme
- GTK3 theme
- Xfwm4 themes (normal and compact)
- xfce-notifyd theme
- Emerald theme
- Metacity theme
- Mutter theme
- Unity support
- Granite widgets support (elementary OS)
To download Greybird in Ubuntu 12.04, run the following commands:
sudo add-apt-repository ppa:shimmerproject/ppa
sudo apt-get update && sudo apt-get install shimmer-themes-greybird
For other distros:
Download the theme from here.
Extract the zip file to the themes directory i.e. "~/.themes/" or "/usr/share/themes/".
Use Gnome Tweak tool or Ubuntu Tweak to choose the themes.