Glow is a beautiful Gtk theme which is based on Aurora Gtk Engine.It has up to 16 colour variants and 2 designs!As the Glow theme is based on the Aurora Gtk Engine,so you can customize colour for Window Background ,Input boxes,Selected Items out of box.
Download the Glow gtk2 theme :http://www.gnome-look.org/content/download.php?content=85996&id=1&tan=56978843
Download its Emerald theme:http://www.gnome-look.org/content/download.php?content=86035&id=1&tan=80977379
Since the Glow theme is based on Aurora Gtk Engine,so you need to install the Aurora Gtk Engine before installing the Glow.
Download the Aurora Gtk Engine:http://www.gnome-look.org/content/show.php/Aurora+Gtk+Engine?content=56438
Guide for installing the Aurora Gtk Engine:http://www.linuxine.com/2008/01/auroraan-awesome-gtk-engine-theme.html
Once you have installed the Aurora Gtk Engine successfully,you can add the Glow theme via Apperance Preference.