There were user-created means to apply wallpapers with earlier hacks, but for those of you checking out the new firmware it might be the first time you've tried them out. I just made this one for myself, but you're welcome to it. I'd link the artist's site, but last time I did that, I'm told that the rack which hosted her equipment burst into flames.
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You can save it right out of the new browser, if you like. Just remember, for your own adventures: 480x272, put it in the PHOTO folder, and hit the Set As Wallpaper menu option in the Photo menu.
(CW)TB