In a food processor, crush the Oreo cookies to create crumbs. Alternatively, add them to a zip-top bag and crush the cookies with a rolling pin.
Divide the crushed Oreo cookies between 3 bowls.
In a large mixing bowl, whisk together vanilla pudding mix and 3 cups of milk, and keep stirring for about a minute or until the mixture begins to thicken.
Add whipped topping to the pudding mixture, and gently fold it in.
Take a bowl of the Oreo cookie crumbs, and divide that between 6 plastic cups.
Divide the pudding mixture by putting a third of the mixture in one bowl, and two-thirds of the mixture in another.
To the smaller bowl, add a few drops of purple gel food coloring, or enough to reach the desired color.
Divide the purple pudding evenly among your cups, filling them about a third full.
Take another bowl of crushed Oreo cookies, and divide evenly among the 6 cups, making the second layer of Oreos on top of the purple pudding mixture.
Take your remaining bowl of pudding, and add a few drops of pink gel food coloring or enough to reach the desired color.
Divide the pink pudding mixture among your cups, leaving just a small amount of space at the top for a final Oreo layer. Discard any excess pink pudding, or use it for another recipe.
Divide the final bowl of crushed oreos between your 6 cups.
Decorate each cup with holiday green sprinkles, and add a Peep marshmallow and a couple of mini egg candies. Serve immediately, or keep in the fridge until you're ready to serve.
Notes
Use your favorite cookie for the crushed cookie crumbs. You can go for chocolate grahams, or any other vanilla cookie that you enjoy. Try golden Oreos or nilla wafers with banana or lemon flavored instant pudding.
For a different flavor instant pudding flavor, try chocolate, banana, lemon, white chocolate, or cheesecake flavor.
Chill the pudding cups if you have time, this will help the pudding to set and the ingredients to meld together.
When layering the contents, try to get even layers for a nice presentation.