Custom coverart treatments

[yardameus 220]

I was just curious if it was possible to tweak coverart treatments with a custom overlay.  Or more so, what all I need to tweak to do so.  I've noticed the coverart folder in the cache and managed to change the image, but unless I keep it exactly the same as the original, the overlay doesn't cover properly.  For example, if I wanted to combine the metro treatment and flat case treatment without the the different colors and labels.  (Generic grey overlay, no labels and smaller but equal overlay on top and bottom)  Or is this something that dynamically changes with coverart and has to be done from the core.

 

Thanks for your time.