This is not only idea anymore, thanks to Jan Zarnikov, who wrote Amarok Fullscreen (http://www.kde-apps.org/content/show.php?content=52641). Thanks, man. Great job!
Implementation of this mockup can be found here:
(it's regular AmarokFS theme)
I woke up today with idea for screen saver for Amarok.
I'm often listing music while doing some other stuff. I think most people doing this at least from time to time. Anyway, when I don't touch my computer, screen saver activates and even if I have Amarok window on my desktop I can't see which track is currently playing.
I think it would be nice to have a screen saver that display some information about current track and its album cover.
It would be also nice if it could quietly display short info about track that will be play after current one (see bottom of the screenshot).
Unfortunately I don't have programming skills necessary to write this screen saver. But I believe it should be hard to do if you use Amarok DCOP calls and ImageMagick or other graphic library (to make this cool shadow beneath the cover - see screenshot) or maybe even some OpenGL (because the "AIGLX/XGL/Compiz/KDE4" future is comming)
Some additional ideas:
1. This screen saver should be disable only by pressing specific key (for example [esc])
2. It shouldn't react for other keys, especially for amarok shortcuts; it should be possible to change tracks/pause them etc. without leaving screen saver
If you like this and want it on your desktop, find KDE/Amarok developers who are willing to do this or just make a bugzilla entry for Amarok/vote for it.