the wavebar is drawn directly onto the player panel - i think it would look really bad if it was surrounded by a box with a different colour
only a quick mock-up, and I haven't done the wavebar or spectro.
ummmmm......the wave bar is exactly how it currently appears (version:2.1.4818) when using my 'Faded' skin. It would seem the background colour from the skin element
<element id="Player.Wavebar" bg="18,19,12" fg="193,188,150" fg2="184,174,71" />
doesn't get changed like the foreground colours do.
maybe leaving the foreground override colours unchanged and matching the background colour would be a better way to go?