Live Wallpaper with a Biomechanical Bog, Will-o'-the-Wisps, ACiD Rain, and Mist! A biomechanical tree sits amidst a brooding atmosphere while playful wisps reveal themselves and then hide amongst the mist and rain. The wisps flock to your finger when you touch the screen. For fans of horror, alien technology, swamps, dark atmospheres, and our skull wallpapers.