First of all it actually is 12.10 wallpaper rotate on 180 degree. Seriously.
It is wrong in 12.10 as well and it is not due to grainy effect. Grainy effect 
actually supposed to hide color banding and it is not supposed to break image 
into small squares. That's actually happens when you over-compress image with 
grainy effect which is clearly bad idea. Grainy images doesn't compress well at 
all — grainy effect will be heavily damaged... like here.
Is there source image without compression?

It actually very pointless to compress it at all. Image will be unpacked
in the memory anyway. Why not to use loseless PNG instead of JPEG?

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https://bugs.launchpad.net/bugs/1081702

Title:
  Update the default wallpaper in 13.04

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