1. In microwave or heavy saucepan, melt chips and shortening, stir until smooth. With a small, new paintbrush, brush white chocolate in a thin layer on underside of each leaf. Refrigerate until set, about 10 minutes. Apply a second layer of white chocolate, chill for at least 15 minutes or overnight. Gently peel leaf from chocolate.
2. For wreath, chill a 14-inch to 16-inch round serving platter in the freezer for at least 15 minutes. Working quickly, scoop 1-1/2 inch balls of sherbet and arrange in ring on the platter. Make a second ring of sherbet scoops inside the first ring. Arrange a third ring on top of the other rings. If sherbet begins to melt, return platter to freezer for 5 minutes.
3. Garnish with white chocolate leaves and fresh raspberries