The issue at hand, as I understand it, is that Ubuntu sets a background image 
for the panel /outside/ of the theme. If you take a look at Panel Properties, 
you'll notice that the background tab has (instead of "None. Use system 
theme"), an arbitrary background image set by default.
This will cause confusion for users and issues with, for example, low contrast 
themes.

I believe this is a hack to fix a bizarre issue where some applets seem to cope 
fine with drawing themselves on top of a user-specified image background but 
fail miserably with all sorts of awful transparency problems when they are 
drawn on even that same background as part of the theme. However, the fix is 
problematic for the reasons outlined here...
Personally, I still think it's worthwhile just for the sake of having a nice 
looking panel, but perhaps a few little hacks will solve it completely. (For 
now).

Deepest apologies if I have managed to double post this.

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[Intrepid]When switch theme, the image of Gnome Panel not change.
https://bugs.launchpad.net/bugs/284975
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