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Wouldn't it be cool if there was a desktop wallpaper that acted in the same way as a desktop background, except it is a video that cycles around the pillar of autumn (like the cutscene at the beggining of the maw). You can download these from halomaps.org to put it as background on halo ce menu screen. Is it possible?
Make your video into an animated gif and set that as background... There are programs out there that can convert videos to gifs. Google is your best friend ;)