5 sm. pkg. Jello (lemon, lime, orange, strawberry or raspberry, blackberry or black cherry)
2 1/2 c. sour cream (or plain yogurt)

Combine lemon Jello with 1 1/4 cups boiling water; stir until dissolved. Reserve out 1/2 cup, pour remaining Jello into 9 x 13 inch pan. Let set about 1/2 hour. While its setting add 1/2 cup sour cream to the reserved Jello, stir until combined. Let Jello-sour cream mixture set out on countertop until the first layer is set. Gently pour sour cream mixture on top of first layer and let set. Continue doing the same thing with each package of Jello in this order: Lime, orange, strawberry, blackberry.

This recipe is not difficult, but it does take about 5 hours for all layers of Jello to completely set. When you are finished you will have 10 very thin layers of Jello that look like a "rainbow".