This is a remake of the "Liferea 32x32 Notification Icons" made by plutoprime.
I just played with saturation and lightness (and added a green exclamation mark) in orden to improve the icons appearance.
They are supposed to be used with the "Show number of new items" option disabled.
Copy the icons to /usr/share/liferea/pixmaps and replace existing icons.
Make a backup of the original icons at your discretion.