Screenshots
Here you can browse the user interface of gtk-gnutella 0.92.1c. Click on the images to get a larger view. There are screenshots of both the GTK1 and the GTK2 GUI's.
For historical interest, you can see screenshots of the older 0.85 (released April 5, 2002) and 0.90 (released July 7, 2002) versions.
GTK1 Screenshots
These screenshots feature the Metal gtk-engine with some tweaking of the font and colors.