A swarm of bats pours across the sky toward a spiky gothic castle perched on a dark ridge. A thin crescent moon glows white-violet in the corner, and the whole scene is washed in purple: lilac clouds, plum hills, deep indigo shadows. Tiny lit windows in the castle add just enough warmth. If you want Halloween on your desktop without orange everywhere, this is the one. It sits just as well on a laptop, at 1280x720.