Gastly, Haunter, and Gengar from Pokemon HD Wallpaper

Three polygonal Pokemon characters, Gastly, Haunter, and Gengar, are displayed in a row against a hexagonal grey background. Gastly is on the left, a purple, smoky ghost with white eyes and fangs. Haunter is in the middle, a purple bipedal ghost with sharp claws and a wide mouth. Gengar is on the right, a larger purple ghost with a wide grin and red eyes.