4 small boxes Jell-O (4 different flavors)
4 envelopes Knox unflavored gelatin
2 cups whole milk
2 cans sweetened condensed milk
1/2 cup sugar
1 tablespoon vanilla

Make the Jell-O using only 1 cup of water for each flavor and put into 4 separate loaf pans.  Let harden.  When the Jell-O is done, cut it into squares and put into a glass Pyrex pan.  Mix the whole milk and sweetened condensed milk in a bowl, adding the sugar and vanilla.  Dissolve the unflavored gelatin with 1 cup of water, then add to milk mixture.  Pour the mixture into the Jell-O pan and let harden for about 3 hours.  Cut into squares and enjoy.  (You can choose the Jell-O flavors depending on the holiday-ex: red and green for Christmas, red and blue for 4th of July.)