(I forgot to take a pic until about half was gone....kids loved it!!)
Glass Block Holiday Jello
4 3-oz. packages assorted Jello (in coordinating colors)
2 packets unflavored gelatin
1 14-oz. can sweetened condensed milk
Spray 4 small food storage containers (like Tupperware/Gladware/Rubbermaid) with non-stick cooking spray. Set aside.
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.
When the Jello has set, bring another 2 c. of water to a boil. While the water is heating, sprinkle 2 packets of unflavored gelatin over 1/2 c. of cold water. Allow to stand for about 4 minutes. When the water is boiling, pour 1 1/2 c. boiling water over the dissolved gelatin and stir to combine. Add the sweetened condensed milk and mix well. Allow to come to room temperature.
Lightly spray a 9x13" pan with non-stick cooking spray. Carefully cut the colored Jello into cubes and gently toss to combine in the 9x13" pan. Pour the cooled milk mixture over the colored Jello and, if necessary, rearrange some of the colored Jello to make sure it is evenly distributed and not sticking out of the white mixture too far.
Place the 9x13" pan in the refrigerator and chill at least 8 hours. Cut into squares, rectangles, or various shapes with cookie cutters and serve.