August 2nd, 2010 – Hippo G.A.S. Mask Eighteenth in the Guerrilla Art Squadron series is the Hippo G.A.S. Mask. I’m not sure why I decided that a hippo should be purple but I’m diggin’ the color scheme. One part Lakers, one part old school Decepticon. Did you know “hippopotamus” comes from the ancient Greek word…