01 - In a medium mixing bowl, dissolve the red gelatin powder in 1 cup of boiling water. Stir thoroughly to ensure the powder is fully dissolved. Add 1/2 cup cold water and mix until combined. Evenly divide the mixture among 8 small clear serving cups. Refrigerate for a minimum of 1 hour, or until the layer is firmly set.
02 - In a separate bowl, whisk together the vanilla pudding mix and 1 1/4 cups cold milk until the pudding thickens and becomes smooth, about 2 minutes. Gently fold in 1 cup whipped topping to create a creamy texture. Once the red layer is set, spoon the pudding mixture evenly over it in each cup. Refrigerate for 30 minutes to allow the layer to firm up.
03 - In a clean bowl, dissolve the blue berry-flavored gelatin in 1 cup boiling water, stirring until fully dissolved. Add 1/2 cup cold water and mix well. Once the white layer is set, carefully pour or ladle the blue gelatin mixture over the pudding layer in each cup. Place cups back in the refrigerator.
04 - Refrigerate assembled cups for an additional 2 to 3 hours, or until all three layers are completely set and distinct.
05 - Just before serving, top each cup with additional whipped topping, fresh berries, and sprinkles if desired for a festive presentation.