SaveHollywood is a Screen Saver module for OS X 10.8 or later. It lets you play movies when your Mac enters screen saver mode.

SaveHollywood lets you define which movies you want to be played. You can either add a movie or a folder of movies.

You can play:

movies shot with your iPhone®, iPad® or iPod® touch.
movie trailers (for example from the iTunes Movie Trailers website).
training materials (for example: WWDC sessions, video podcasts, exported Keynote® documents)
etc.

You can sort movies manually so that they get played in the order you like or you can choose to play them in random order.