01 - Dissolve strawberry or cherry gelatin in 1 cup boiling water in a medium bowl. Stir until completely dissolved, then incorporate 1/2 cup cold water. Divide the mixture evenly among 8 small clear serving cups. Refrigerate for at least 1 hour, or until set.
02 - In a separate bowl, whisk vanilla pudding mix with 1 1/4 cups cold milk until smooth and thickened, approximately 2 minutes. Gently fold in 1 cup whipped topping. Once the red gelatin base is set, evenly spoon the pudding over each cup, creating the white middle layer. Refrigerate for 30 minutes to set.
03 - Dissolve berry blue gelatin in 1 cup boiling water, mixing well. Add 1/2 cup cold water, stirring to combine. Once the white layer has set, gently pour or spoon blue gelatin over each cup to form the final layer.
04 - Refrigerate the assembled cups for a minimum of 2 to 3 hours, allowing all layers to fully set and chill.
05 - Just before serving, top each cup with additional whipped topping, a selection of fresh berries, and sprinkles if desired.