Comment 1 for bug 994246

Log in: We already have a "transition" in 12.04 that is maintaining the same wallpaper. But maybe we want something smoother like the shell and desktop to fade in from that. That could be implemented as a clone window of the wallpaper starting over all other windows and then fading out to transparent. However we would need to be careful to ensure the desktop (like nautilus etc) doesn't start before compiz.

Log out: Would need to do the opposite of log in. Perhaps fade out windows and unity to just the wallpaper. So it's seamless to lightdm.

Shutdown: Maybe fade out to aubergine to match the colour plymouth uses.