It appears that you are no longer able to add 3rd party screen savers. I used one called Padbury Clock.saver which was just a big clock. I know there are some similar ones that apple made, but never exactly what I wanted. One other thing I noticed is that even if I tell my computer not too put the display to sleep, it will black out my screen after a certain amount of time (haven't figured it out yet). Typically I like the screen saver to stay on all night so I can see the time. I know this is a small thing but still something that maybe worth noting.