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In 10.4, when you press the '+' symbol in the bottom left corner while Dashboard is active, the Dashboard shelf slides up into view containing all your widgets. The background image used for the shelf can be found here:
/System/Library/CoreServices/Dock.app/Contents/Resources/perf.png
You can replace this image with any PNG image you like and it'll be tiled, or you can use a single, full width image. The shelf is 118 pixels high and as wide as your monitor (1024 pixels in my case), so you can use those dimensions to construct your own shelf background. Also in the same directory are the images for the next and previous arrows on the shelf.
Go be creative!
http://www.macosxhints.com/article.php?story=20050426093145147
/System/Library/CoreServices/Dock.app/Contents/Resources/perf.png
You can replace this image with any PNG image you like and it'll be tiled, or you can use a single, full width image. The shelf is 118 pixels high and as wide as your monitor (1024 pixels in my case), so you can use those dimensions to construct your own shelf background. Also in the same directory are the images for the next and previous arrows on the shelf.
Go be creative!
http://www.macosxhints.com/article.php?story=20050426093145147