Sonar 3.5, Adwaita-like GTK+2 theme
GNOME 3 was launched months ago, and along with awesome features, a fresh GTK+3 theme, Adwaita, appeared on our desktop.
Sonar 3.5 is an Adwaita-like GTK+2 theme that brings a feel of GNOME 3/GTK+3 on a GNOME 2/GTK+2 desktop and feels complete due to its "global" redesign approach (buttons, scrollbars, arrowstyle, menustyle, etc).
How do we install Sonar 3.5 GTK+2 theme?
Download it from here, right-click on the desktop-->Change Desktop Background-->Theme-->Install-->select your downloaded theme.