yes, this could be, but i'm looking for a way not to implement 1000 3th party tools, i'd like to see this stuff in the skin if its possible. I understand it has something to do with .png pictures, i'll try to look into this.to change the MP volume OSD would require manually editing the xml files and creating new png images for the osd.
there are 3rd party volume OSDs if you can disable the inbuilt MP volume OSD then you can use a standalone volume osd. or you can use both.
more available with a google search