~$ dpkg -l gtk2* | grep ^i
ii gtk2-engines-crux 2.6.1-1 the Crux theme engine for GTK+ 2.x
ii gtk2-engines-industrial 0.2.46.0 Flat-looking GTK+ 2.x engine from Ximian
ii gtk2-engines-lighthouseblue 2.6.1-1 LighthouseBlue theme for GTK+ 2.x
ii gtk2-engines-mist 2.6.1-1 flat theme for GTK+ 2.x
ii gtk2-engines-pixbuf 2.8.18-1 Pixbuf-based theme for GTK+ 2.x
ii gtk2-engines-redmond95 2.6.1-1 Windows-like theme for GTK+ 2.x
ii gtk2-engines-smooth 0.6.0.1-4 Smooth Engine for GTK+ 2.x
ii gtk2-engines-spherecrystal 0.7-11 A blue vector theme for GTK+ 2.x
ii gtk2-engines-thinice 2.6.1-1 the ThinIce theme engine for GTK+ 2.x