Prepare the red velvet cake according to the package directions.

Allow the baked cake to cool completely.

Meanwhile, whisk together the pudding mixes and milk until smooth.

Add half of the Cool Whip (about 6 ounces) and mix until well combined.

Add a generous amount of green gel food coloring, whisking until the color is incorporated.

Allow this mixture to chill in the refrigerator while the cake finishes cooling.

To assemble the trifle, cut the cake into cubes.

Add half of the cake to the bottom of your trifle bowl. Top that with about half of the pudding mixture.

Add a layer of the remaining cake pieces and top with the rest of the pudding mix.

Top the trifle with the remaining Cool Whip (about 6 ounces) and smooth evenly.

Top with Christmas sprinkles.