Tango icons for liferea. I wanted to come out with a much better approach than what's been used for the notification area icon but I couldn't because of the way liferea reads the icons (the icon of 'new items' is the same as 'feed', so I couldn't do anything very flashing).
You can just copy the pixmap folder included over the liferea's actual one (the same way you'd do with gaim) or you can let the included script do it for you.
To run the script spawn a console in the folder that appeared when you unarchived the file, and do ./install [liferea share dir], where [liferea share dir] is the parent directory of liferea's pixmaps folder, which is usually /opt/gnome/share/liferea or /usr/share/liferea.
However the script is pretty crapy, if you see anything is wrong do it manually.
The script requires sudo.