First, in 4 separate bowls place 1 cup each of whipped cream. Add 20 drops of different food coloring in each separate bowl.
Next, mix to combine until each look like their individual colors.
Now, using a 9 x 9 pan overlay saran wrap in the pan (see video above).
Next, line bottom of pan with 1 layer of graham crackers.
Now, layer carefully one color whipped topping, the repeat with each color. Try not to mix the colors so you get rainbow at end.
Top with layer of graham crackers. Wrap top with saran wrap and freeze overnight.
Finally, unwrap, cut in squares, and enjoy!