Using an electric hand mixer on high, beat cream, pudding and vanilla for 1 minute. Slice croissants in half lengthwise. Spoon pudding mixture in plastic food storage bag and seal. Cut one of bottom corners off. Pipe filling onto bottom halves of croissants. Arrange 5 strawberry slices, 5 raspberries and 7 blueberries over filling. Arrange croissant top over fruit; sprinkle with powdered sugar.