General wallpaper for home screen and lock screen

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http://androidforums.com – I've tried setting two different wallpapers, but had no luck. When I press the home icon down there I can see the wallpaper I had set to, as well as when I am on the password screen. But, when I press the same button to go back from the home screen, I see a black background. How can I get another background on that screen? In other words, I want three different backgrounds : one for lock screen, one for home, and one to replace that black background, which I assume is the default. (General)