What better way to have some fun than a SNOWBALL FIGHT?  Especially if the snowballs are loaded with cryo explosives!  Craft Snowball grenades at the chem station under "Grenade."  Or, to really step up your snowball game, retrieve the Cryolator and fit it with a custom Snowball Barrel and explosive Snowball Ammo (also crafted at Chem Station, under "Utility").