This is a theme using the new feature included in my modified NowPlaying screenlet v.0.3.3.3.
For more details regarding the skinning feature visit the screenlet page: http://gnome-look.org/content/show.php?content=136480
You can take this theme as an example for new and more flexible themes for the NowPlaying screenlet.
sudo apt-get install imagemagick
sudo apt-get install screenlets
NowPlaying screenlet (>= v.0.3.3.3 improved by BruceLee):
Copy the folder "Broken_Glass" to "~/.screenlets/NowPlaying/themes/"