This is a combination of favorite things! Grandma Marion always had a bowl or glass baking pan in the fridge with Jello & fruit. I've been a #1 Fan of the Philadelphia No Bake Cheesecake recipe since it was introduced, and have made numerous variations since. This I changed up the cheesecake by using lime juice instead of lemon juice, but I don't use as much juice as the original recipe did. I also base my cheesecake on the cream cheese and sweetened condensed milk version with lemon or lime juice.
Sort through the pint box of fresh blueberries, discarding any damaged berries and removing stems. Set aside.
Add 1 1/2C boiling water to bowl with the Berry Blue Jello powder mixture from both boxes, stir until dissolved. Add the ice cubes, and stir until ice cubes are melted. Carefully stir in the blueberries and pour into a medium sized mixing bowl or a good sized jello mold. Chill until set, at least 30 minutes, I let mine set closer to 1hr.
In a medium mixing bowl, place the softened 8oz package of cream cheese and add the entire can of sweetened condensed milk. Mix with rotary mixer until smooth, and add the lime or lemon juice in small amounts [if you put the juice in at the beginning of mixing, you will end up with a lumpy mixture that takes much longer to blend smooth and fluffy-ish]. Remove bowl with the blueberry layer from fridge, and carefully pour the cheesecake batter over that layer, using a rubber spatula/bowl scraper to transfer the batter to the bowl. Carefully spread the cheesecake layer evenly across the bowl. Chill until set, at least another 30 minutes or longer.
Top the quart box of fresh strawberries and slice into a small mixing bowl while you get the teakettle full of water back to boiling. Set aside. Repeat the instructions for making the Strawberry layer of Jello same as you made the Blueberry layer. Add the sliced strawberries and carefully pour over the cheesecake layer. Return to fridge and chill until the strawberry layer is well set.
You can make this a day ahead. You can unmold the dessert from the bowl or jello mold it's in, but I just use a spoon and serve it from the bowl. I haven't had a lot of success at using Jello molds. ;)