Green appears because the water that freezes is extremely rich in algae, hence the colour. Brown, yellow, and even black stripes are caused by sediments picked up along the way when the ice sheet was sliding downhill.
Red cowboy boots with shorts and always a sword in his hand..... Slaying dragons and bad guys.... "Say your prayers, Hook"..... Saving mom from pirates...... Going after Sadam Hussein to save America........that's my son.