If you want to create a screensaver from your videos or images, then I can recommend you iScreensaver Personal 4 because it has the ability to create beautiful screensavers on the base of videos.
The process of creating the actual screensaver is founded on few easy steps required to create the product. Add your files, customize the output and the job is done. You will have your screensaver created in a matter of seconds, then you can use it as your default screensaver.