Mac OS Video
Motion Backgrounds is a striking set of 55 animated designs for adding intensity to any Keynote presentation. Copy a motion background, paste it to your slides, and watch them liven up. All backgrounds are available in 1024 x 768 px. In addition, the files are arranged for looping to allow endless playback of any background in the package.
Simply choose QuickTime Inspector in Keynote and select Loop under the Repeat pop-up.
10 Motion Backgrounds.