Buzz Launcher has that function built in. Otherwise I really like the app Multi Picture Live Wallpaper. Not only can you put a different wall on each page, you can set each page to individually change the wallpaper at your desired frequency or if you double tap the screen. It's a great app.
I had a folder for homepage walls, another page I made for media and gad the wallpaper scroll through movie posters. Then I had a page for camera and gallery and had the wallpaper scroll though photos I had taken.
I believe it's still a free app too.
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