iOS: Ever wanted circular folders instead of the squared off ones on your iPhone? Youtube user videosdebarraquito shows off how to do that by using a special wallpaper image.
To do this, you'll need to download one of these tiny, 3x3 images, then set it as your home screen wallpaper (Settings > Wallpaper > Choose a New Wallpaper > Camera Roll). Once you do, you'll notice that all your folders on the main page turn into circles. This doesn't work with multiple pages, but it's a fun little trick nonetheless.