You can have your GTK2 cake and eat it with the following theme – it combines elements for Ubuntu’s default Ambiance theme with the light-tones of Ubuntu’s Radiance theme.
The theme was created by DeviantArt user ~simplygreat, whose previous work includes a dark toolbar mod for Nautilus Elementary.
The theme, which currently lacks a name, is in development and requires the installation of the “Equinox” GTK engine.
Unity users should note that whilst the theme was not designed for the Unity desktop it does work okay under it.
Nautilus-Elementary is required for parts of the theme to display correctly.
Download | simplygreat.deviantart.com/gallery/#/d48s694