1. Fill the tart shell with pastry cream.

2. Gently press a medium to large star-shaped cookie cutter into the center of the tart to make a slight imprint in the pastry cream for the star pattern; remove the cookie cutter.

3. For the blueberry star: Arrange blueberries in the center of the star outline. Fill the spaces surrounding the star with upside-down raspberries, creating a circular center. Arrange 2 to 3 layers of strawberries in a circular pattern around the perimeter of the raspberries to finish.

4. For the strawberry star: Select similarly sized strawberry slices for the tips of the star. Starting at the tip of one point, layer strawberries inward towards the center. Repeat with remaining 4 tips. Fill in the spaces surrounding the star with stem-side-up blueberries, creating a circular border. Place upside-down raspberries around blueberry perimeter to fill in the remainder of the tart.

5. Chill until ready to serve, at least 30 minutes and up to 8 hours.