I gave your request a thought.

Basically you want your album art to be your backgrnd when the song plays. (I watched the video you posted).

try this qtlockscreen.ini and you should be seeing that.

The only problem is there wont be many songs which have a album art of size 480x800. A smaller one only occupies part of your screen.

If you know where i can get good quality album art let me know too.

And ya one more thing. the transition will not be as smooth as you shown in the video.