Some people have reported left-over pieces of dock 'poofs' on their desktop. These bits remain through resolution and color changes, and seem indefeatable until you logout and login again.
There's an easier way to get rid of them -- just launch ProcessViewer (in the Utilities folder), and look for the "Dock" process. Highlight it and then select the Quit Process menu item. The dock will quit, the 'poof parts' will vanish, and the dock will then restart.
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Mac OS X Hints
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