Some extra Tango artwork
Most of GNOME applications try to use stock icons, so they match your current icon theme, giving your desktop unified look. But some apps use their own icons and other artwork that sometimes doesn’t match your default icon theme. I’m obviously talking about Tango icon theme.
I found quite a few individual “projects” from different artists, providing Tangofied icons for various GNOME applications, so they look even better. 
For Gaim - instant messenger:
For Liferea - RSS reader:
For Downloader for X - download manager:
For Banshee - music managemet and playback:
For GIMP - image manipulation program:
- Theme (not really a theme)
These are my favourite ones. There are probably more of them out there, but these are for my apps which I use on daily basis.