In a small bowl combine 2 packages of gelatin and 1/2 cup cold water. Set aside.
Heat 2 cups milk and combine milk and gelatin together. Boil in the microwave for 2 minutes.
While milk and gelatin are boiling up, in a separate bowl combine together 1 cup sugar, 2 cups sour cream, and 1/2 teaspoon of dry vanilla.
Combine milk with sour cream mix. This is the whipped part of the layered jello. Keep it warm so it does not stiffen quickly.
Pour a thin layer into a baking dish or cups.
For the jello, follow the package instructions on each box. Mix each color as soon as you are ready to put it in your dish.
As soon as each color layer stiffens in the fridge, pour another layer and refrigerate. Continue until the dish fills up. And there you got a colorful and fun treat!