I used to use a different Mission Control Background instead of the default. But then, since I upgraded (updated) to Mavericks, my mission control background reverted back to default. I've tried searching for the Contents of Dock.app, but I can't find defaultdesktop. I really wanna change the background. Does any one know how to do this is in Mavericks? P.S. It would be nice if you can also tell me how to change the Notification Center's background.