Here are several fractal “wallpapers” suitable for the background of your phone, tablet, or portable device. Just tap on one you like to download it to your device. Once downloaded, open it and “set as” your desktop wallpaper.
These images are rendered with 8x oversampling at a modest 800x800 pixels square, which will fit nicely on most devices. The square shape accommodates portrait and landscape orientation, as well as desktop scrolling.