Beat the whipping cream in a medium-sized bowl until it forms soft peaks. Whip in icing sugar until stiff peaks form, then whisk in vanilla yogurt. Wash the berries and set aside 4 small, nicely shaped ones for garnish. Hull and slice the remaining berries. Gently fold the strawberries into the cream/yogurt mixture. Spoon into decorative glasses. Thoroughly chill for at least 1 hour. Just before serving, garnish with a whole strawberry, sliced and fanned if desired.