Make a number of snowballs one fewer than number of players you have.
Hide a brightly colored button inside one of the snowballs.
Choose one player to be it. The other players stand in a circle around him and pass the snowballs quickly around the circle until he tells them to stop.
He must then guess which player has the snowball with the button inside.
The players break open their snowballs to see if he has guessed correctly. If not, he's it again for the next round; if so, the player holding the button becomes it.