Begin with the blue layer. Follow the instructions on the package, usually mixing the Berry Blue Jello powder with one cup of boiling water until dissolved, then add one cup of cold water. Pour this mixture into the clear plastic cups, filling only a third of each cup. Put the cups in the refrigerator to set, which takes about 1-2 hours.
While the blue layer is setting, prepare the white layer. Mix the unflavored gelatin with one cup of boiling water until dissolved. Stir in the sweetened condensed milk until well mixed. Allow this mixture to cool to room temperature before pouring it over the set blue layer. Return the cups to the refrigerator and let them set for another 1-2 hours.
Finally, prepare the red layer. Similar to the blue layer, mix the Strawberry or Cherry Jello powder with one cup of boiling water until dissolved, then add one cup of cold water. Once the mixture has cooled to room temperature, pour it over the set white layer. Return the cups to the refrigerator for a final setting period.
Serve chilled. For a decorative touch, add a dollop of whipped cream and a fresh blueberry or strawberry on top.
