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10.7: Change the Dashboard background System 10.7
Mac OS X Lion introduced Mission Control and a whole new way to organize desktops. In the process they made it possible to set a different image for each Desktop, but in the Dashboard we're stuck with a boring gray bathmat texture that can't be changed. But it turns that in Lion the new Dashboard is just another Desktop after all.

I wrote a random image fetching Dashboard widget (ImagesForever) that has a 'set desktop' button. 'Set Desktop' normally applies to the current desktop, but in Lion the Dashboard isn't an overlay, but a whole separate space of its own. So in Lion 'set desktop' now applies to the Dashboard background. A very cool and unexpected side-effect.

The widget's code just calls the usual AppleScript to set the desktop background, so it should be very easy to make a dashboard droplet that does the same thing. The AppleScript to set the desktop is quite simple:

tell application 'Finder' to set desktop picture to POSIX file '/path/to/MyImage.jpg'

[crarko adds: It's pretty well known that the Dashboard in Lion is just a Space, but this is a good application of existing knowledge.]
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10.7: Change the Dashboard background
Authored by: Xantilon on Dec 13, '11 04:47:59PM

Interesting post, but it leaves some questions. How about scale modes? Can it use tiling? And how do I get back to the default?

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