A close friend with a fuzzy memory asked me to write about setting the default wallpaper for the OS image. After grumbling about a little bit, I thought that it might be a valuable little post. The desktop wallpaper or background image is set in the registry as:
[HKEY_CURRENT_USER\ControlPanel\Desktop]
                "wallpaper"=”<\\Windows\\WindowsCE.bmp”
This is set in Common.reg, so you can override it in your Platform.reg or Project.reg.
You may also want to look at Summary of Registry Posts
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