If you have 6 hours to spare, this is so pretty and strangely so fun to watch take shape.
6 - 3 oz boxes of jello, rainbow colors/flavors
1-16 oz sour cream
Mix 1 box at a time with 1 cup boiling water
Pour half cup of the liquid jello into an 8x10 pan and put into the fridge for 30 minutes
While that sets up, mix the remaining half cup of liquid jello with 1/3 cup sour cream.
Pour on set layer of jello.
Repeat a million times until you get 12 layers of ROYGBIV
Top with homemade whipping cream