The new Windows tray manager is right now using a simple down-scaled version of the Freenet bunny. It works okay, but it isn't optimal.
If anyone can fix up a better icon, please feel free to do so. The current ones are available here: Icon for "active": http://github.com/freenet/wininstaller-staging/raw/7976746de8f198e04f39c9a7b0f0e740c559a9d4/src_freenetinstaller/files_install/freenet.ico Icon for "inactive": http://github.com/freenet/wininstaller-staging/raw/7976746de8f198e04f39c9a7b0f0e740c559a9d4/src_freenetinstaller/files_install/freenetoffline.ico Reference icon (bigger sizes available inside): http://github.com/freenet/wininstaller-staging/raw/8861cd5be416ead97ffe68ff9fdaa76c285d7fb9/src_freenetinstaller/FreenetInstaller_Icon.ico - Zero3