Endless Walls provides access to more than 7,000 iPhone wallpapers and growing. Wallpapers are presented as a slideshow, viewable anywhere with WiFi, 3G, or Edge data access. Save as many wallpapers as you like to your phone, which you can then apply as your wallpaper, email wallpapers to your friends, and pause and resume the slideshow. You can also toggle on and off the NSFW filter.