For privacy reasons, there should be two versions of the notification icon for vino, one for when it is running, and one for when a client is connected. The connected one should be _highly visible_ perhaps even animated every couple of minutes to remind the user of the spectator. Since what attracts the human eyes most apart from contrast is movement, I think a good contrasted icon with a saturated accent color (red?) with a constant fading in/out animation would be best.