~$ 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