01 - In a mixing bowl, combine the red gelatin dessert mix with 1 cup boiling water, stirring until fully dissolved. Mix in 1/2 cup cold water. Evenly divide the red mixture among 8 clear serving cups. Refrigerate for at least 1 hour, or until the layer is firm.
02 - In a separate bowl, whisk together the instant vanilla pudding mix and 1 1/4 cups cold whole milk for about 2 minutes until smooth and thickened. Fold in 1 cup whipped topping until fully incorporated. Once the red layer is set, gently spoon the pudding mixture over it, distributing evenly among the cups. Chill for 30 minutes.
03 - In a clean bowl, dissolve the berry blue gelatin dessert mix in 1 cup boiling water, stirring thoroughly. Add 1/2 cup cold water and mix well. When the white layer has set, slowly pour or spoon the blue mixture over the pudding in each cup. Do not disturb the layers.
04 - Refrigerate the assembled cups for at least 2 to 3 hours until fully set and firm throughout.
05 - Before serving, top each cup with a dollop of whipped topping, a few fresh berries, and sprinkles as desired for a festive finish.