Mobile Wallpaper Black; I Didn’t Enjoy My Training But I Told Myself Don’t Give Up. A black mobile wallpaper is simplicity in its most elegant form. It’s a canvas of tranquility, a blank slate that allows icons and content to stand out vividly, creating a striking contrast. Black wallpapers also save energy on certain types of displays and are easy on the eyes in low-light conditions. They exude a sense of sophistication and mystery, like gazing into the depths of the night sky.