The animated dreams are very cool. And according to the information so far dreams can be dynamically generated. There is a ready source of dynamically generated full-screen animations: screensavers. I am not sure it is possible, but if it is I think it would be very useful to have the ability to set any screensaver as your desktop background. There are a lot of really beautiful screensavers, far more than there are dreams. And dreamscene could just tap into windows built-in screensaver list to keep track of them.

I think the opposite would also be very useful. Having the ability to set a dream as your screensaver could be pretty useful.

Similarly, having the ability to use windows media player visualizations as dreams would be pretty cool, especially if they could react to music currently being played. Being able to have them to "play" music files silently in the background and react to them when windows media player is not being used could allow them to do something when there is no music.

Obviously these could be very CPU or GPU-intensive to render, but that could potentially be the case with any dream.