I don't know if Picasa uses user icons set, so the simplest way to use this is replace icon in menu:
PPM -> gnome menu -> edit menu -> programs -> graphics -> picasa -> picasa -> properties -> click on the actual icon and select new one
enjoy it

Source (link to git-repo or to original if based on someone elses unmodified work):
Ratings & Comments
2 Comments
Thank you for this icon, was missing it. Looks great!
no problem, I made it 'cause I missed this too ;) thanks