Step 1

In a bowl dissolve strawberry jello in 2 c. boiling water. Then stir in 2 c. of cold water. Add strawberries. Refrigerate until firm, which is about 2-3 hours. Make sure it is firm before next layer.

Step 2

Put 1/2 c. cold water in saucepan. Sprinkle unflavored gelatin over water. Let stand for 1 minute. Add milk and sugar, cook and stir over medium heat until gelatin and sugar are completely dissolved. Cool this mixture to room temperature then whisk in vanilla and sour cream. Pour over strawberry jello and refrigerate until firm, about 2 hours.

Step 3

Dissolve blue jello and 2 c. of boiling water in a medium bowl. Stir in 2 c. cold water and add blueberries. Spoon this mixture over white layer in trifle bowl. Chill until set about 4 hours.

Step 4

Top with Cool Whip, blueberries and strawberries.