I use a 32 pixel height for Gnome Panel with larger Icons and I found it unpleasant for liferea icon to be so tiny and not scale properly, so I made these Icons real quick and I think it looks nicer now.

Icons are based on Tango so they fall under the same License.

Instructions:

Copy the icons to /usr/share/liferea/pixamps and replace existing icons.

Make a backup of the original icons at your discretion.