So I made my own pins skin and modded the free music application 'music mod'
I've themed the 4x3 widget, but it doesn't take up the whole screen, as you can see by the screen shot. You need a launcher with the ability to resize (i think) not tried otherwise.
I take no credit for the application, all I did was edit the XML and add my own version of pins music skin.
Not sure which roms this will work on, I'm on CM7 and it works perfectly.
Just install the APK and select the 4x3 music widget. DONE