The StarMessage is a screensaver that shows the current moon phase, inside a highly realistic presentation of a starry sky. You may leave a series of short messages (or even better, wishes) on the screen, and the stars will move around to form the messages. A scrolling message can appear at the bottom of the screen as well. Finally, it does not forget to protect both your screen and your eyes by using low intensity background graphics.
Installation and removal is very easy.
Mac OS X 10.11,
Mac OS X 10.9,
Mac OS X 10.10,
Mac OS X 10.8,