01 - In a medium mixing bowl, dissolve the red-flavored gelatin in 1 cup of boiling water. Stir thoroughly to ensure full dissolution, then add 1/2 cup cold water. Evenly distribute the mixture among 8 small clear serving cups. Chill in the refrigerator for at least 1 hour until firm.
02 - In a separate bowl, whisk together the instant vanilla pudding mix and 1 1/4 cups cold milk for about 2 minutes until the mixture thickens. Gently fold in 1 cup whipped topping until fully combined. Once the red gelatin has set, carefully spoon the white pudding layer over the red layer in each cup. Chill for 30 minutes.
03 - Combine the berry blue-flavored gelatin with 1 cup boiling water in a bowl, stirring until dissolved. Add 1/2 cup cold water. When the white layer is set, gently spoon or pour the blue gelatin mixture on top of the white layer. Take care to avoid disrupting the layers.
04 - Refrigerate the assembled cups for at least 2 to 3 more hours until all layers are completely set and firm.
05 - Just before serving, top each cup with additional whipped topping, fresh berries, and sprinkles as desired.