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Maybe use Clear Dock or Transparent Dock to remove the dock background so you're just left with the trapezoid. Nice work though! 🙂
 
A couple of days ago I started using Menufela to hide my menu bar and Camouflage to hide my icons. My dock is also set to autohide. I now have a pristine, blank desktop image, with Quicksilver if I need to open anything.

It's magical, man.
 
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