You get a small amount of snowflakes from either from TBT's Advent Calendar. Larger amounts can be gotten from participating in the Season of Giving activities. There are activities ranging from creative writing, to decorating a room at Harvey's, to guessing what is inside strange-shaped presents.
The token is still available from the Advent Calendar today, it's to be entered into a raffle to earn a limited edition collectable that will only otherwise be available to people who win the Season of Giving contests.