View the night sky with the current moon phase.
You can go to the "power" settings of the screensaver to keep your computer "awake" for the next two or eight hours. Examples where you might need this: if your computer is left to complete a lengthy operation, like downloading a big file, the computer might automatically enter an inactivity state and disrupt your operation. Do you want to leave the screensaver running (without the monitor being switched off) so you can see the night sky before you go to sleep?
Screensaver of morphing abstract animations, shared over the Internet.
Turn your Mac into a minimalist clock.
Watch aerial views of various places as your screensaver.