This recipe is perfect for Saint Patrick's Day or any other holiday, by changing the colors. For Christmas you can do red and green, Easter - yellow and purple, etc. I got this recipe from my mom.
1 package (3oz) jello in 6 different flavors
16oz sour cream
13x9 in pan
HOW TO PREPARE:
Start with the darkest color on the bottom of the pan.
Pour 8oz (1 cup) boiling water into 2 cup measuring cup or bowl. Dissolve 1 package jello in this which makes 10 ounces. Pour 5 ounces (a little over a half cup) into another bowl and set aside. Into the 5 ounce bowl, mix 1/3 cup sour cream and whisk until creamy without clumps of sour cream. Pour this into the 13x9 pan. Chill for 30 minutes or until set. Pour 3 TBSP water into the second bowl of 5oz of jello and slowly pour over the first layer of jello after the 30 minutes are up. Put back in refrigerator and let set for 30 minutes. Repeat with the 5 other flavors. Cut into square and serve - very pretty!
I think doing the sour cream layer on the bottom looks prettier, but if you accidentally do it the other way around - it's no big deal. Just stick with the pattern you start with for a nice effect.