I've been collecting links to Dreamscene suitable videos (high quality, minimal camera moves, no people or animals to distract the eye) for Dreamscene. I look forward to its official release so I will have a site/gallery/location to post these links, or converted videos if needed.
I've been testing them using VLC's "wallpaper" feature, which is the closest thing to Dreamscene for XP. It doesn't respect the transparency of WindowBlinds glass-like windows, but it handles ObjectDock and a lot of other things well, so for now it's the best equivalent (and it's free).