Combine the flour and salt in a large bowl. Slice the cold butter into ¼-inch sized cubes. Work these into the flour using a pastry blender until the mixture is coarse and shaggy.
Move half of this flour mixture into another bowl, labeled Bowl 1—this is for the bottom crust.
The rest of the mixture is for the top crust and should be divided as follows:—Place half of the remaining mixture in one medium bowl, labeled Bowl 2. (This is for the red dough.)—Divide the remaining mixture equally between two small bowls: label one as Bowl 3 (white dough) and the other as Bowl 4 (blue dough.) Take Bowl 1—add 3 tablespoons of ice water to it. Use a spoon to toss the mixture together until it looks shaggy. Squeeze some dough together with your hand: if it sticks together easily it's ready. If it is still dry and crumbly, add a little more water, stir, and test the dough again.
When it is moist enough, turn the dough out onto a work surface; use your hands to squeeze the dough together into a ball. Pieces of butter will still be visible. Flatten the dough into a disk, wrap it in plastic, label it as "bottom crust" and put it in the fridge.
Take Bowl 3—add a tablespoon of water to it. Follow the same steps as above to mix the water into the dry mixture, then squeeze it into a ball. Flatten it, wrap it in plastic, label it as "white top crust", and refrigerate it.
Pour ½ cup of ice water into a small bowl and add a few drops of red food coloring to it—I use 5 drops of concentrated gel coloring; you may need more depending on your food coloring.) Stir the water and color together.
Take Bowl 2—add 2 tablespoons of the red water to the dry mixture. Toss it together with a spoon, give it the squeeze test, and add more water if needed. When it's moist enough squeeze the dough into a ball: the color will be splotchy but that's ok. It will get worked in further when the dough gets rolled. Flatten it, wrap it in plastic, and refrigerate it.
Pour ½ cup of ice water into another small bowl, add a few drops of blue food color, and stir it in.
Take Bowl 4—Add 1 tablespoon of blue water the mixture and stir it together. Test the dough, and when it's moist enough squeeze it together into a ball. (Splotchy color is okay.) Flatten it, wrap it in plastic, and refrigerate it.
Refrigerate all the doughs for at least 30 minutes.