Snowball fight using newspapers
Divide the group up into 2, 3 or 4 teams, depending on how many people you have. Divide the room up into 2, 3 or 4 as appropriate. Give each team a pile of half sheets of newspaper. On the whistle they are to scrunch up the newspapers and throw them at another team. Obviously 'snowballs' landing in their area can be thrown back. After a defined length of time, blow the whistle and the team with the least amount of snowballs in their area are the winners.