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Spray 4 small square containers nonstick cooking spray. Set aside.
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Bring 5+ cups of water to a boil. Combine 1 c. boiling water with 1 package of Jello, stirring until dissolved. Place the dissolved Jello in one of the prepared containers. Repeat with the remaining packages of Jello. Refrigerate for at least 4 hours, preferable overnight.
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When the Jello has set, bring another 1 ½ cup of water to a boil. While the water is heating, sprinkle 2 packets of unflavored gelatin over ½ c. of cold water. Allow to stand for about 4 minutes. When the water has come to a boil, pour 1 ½ cup boiling water over the dissolved gelatin and stir to combine. Add the sweetened condensed milk and mix well. Allow to cool to room temperature.
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Lightly spray a 9×13-inch pan with nonstick cooking spray. Carefully cut the colored Jello into cubes and gently toss to combine in the 9×13-inch pan. Pour the cooled milk mixture over the colored Jello. Press down any jello cubes that are sticking too far out of the white mixture.
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Place the pan in the refrigerator and chill overnight. Use a star-shaped cookie cutter to carefully cut stars out of the jello. Refrigerate until ready to serve.