In a large bowl, dissolve the Jello in the boiling water, stirring with a fork 'til the Jello fully dissolves.
Measure 1/2 cup blueberry juice and 1/2 cup pineapple juice from the fruit and add to the Jello.
Add the blueberries and pineapple to the Jello, stirring 'til everything is combined well.
Cover and chill in the fridge for about 4 hours, or 'til the Jello sets.
In a large mixing bowl, cream together the beaten cream cheese, sugar, sour cream, and vanilla extract.
Use a rubber spatula to spread this creamy mixture on top of the Jello.
Sprinkle chopped pecans on top, and it's ready to serve!