Preheat oven to 325°F (163°C).
Make the crust: In a bowl, combine graham cracker crumbs, sugar, and melted butter. Press into the bottom of a 9-inch pie pan. Bake for 8–10 minutes. Let cool.
Prepare the filling: Beat the cream cheese and sugar together until smooth. Add vanilla extract and mix well. Fold in whipped topping until fully combined.
Divide the mixture into three bowls. Tint each bowl with a different pastel food coloring.
Spoon dollops of each color randomly into the crust. Gently swirl using a spatula or knife to create a marbled effect.
Chill the pie in the refrigerator for at least 2 hours, or until set.
Serve cold, topped with sprinkles, extra whipped cream, or fresh berries if desired.