Skull and Crossbones Ice Tray is available black. Skull and Crossbones shaped ice cubes. Just fill the flexible silicone rubber tray with water or your favorite fruit juice and freeze, a fun way to chill with your favorite drink. They also make great Jell-O bites for a cool confection on a hot day, or fill with melted chocolate. Form makes four Skulls and four Crossbones shapes. Each piece measures approximately 1 3/4" x 1 1/2".