Since there is about a trillion versions of Green Stuff on the internet, I'm posting my favorite here on the blog so I don't have to scour the internet three times a year to find the recipe I like.
1 large box lime Jello
12 ounce can of crushed pineapple
8 ounce package cream cheese
1 package of small marshmallows
large whipping cream
Drain pineapple and set juice aside. Mix cream cheese and pineapple. Set aside. Make Jello following package instructions, but use pineapple juice instead of water. Chill the Jello until firm. Blend cheese and pineapple with Jello. Don't be afraid to stir. Then blend about 3/4 of the package of small marshmallows. Stir until well blended. Then add whipping cream. Blend until there isn't any green showing. Cover and refrigerate until set and then serve.