Combine Lime jello package, Pineapple juice from drained crushed pineapple, and water in bowl cook according to directions Let partially congeal ( if you let is set all the way you will have to start over and its not fun) , then Whip.
Add 1/2 pint Sour Cream, Crushed pineapple, Pecans, and Marachino Cherries. Mix Well
Pour in to Mold or Bowl until Set