DRAIN guava shells, reserving liquid in 2-cup measuring cup; set liquid aside. Reserve 2 of the guava shells for later use as garnish, if desired. Chop remaining guava shells; set aside.
STIR boiling water into dry gelatin mix in medium bowl at least 2 min. until completely dissolved. Add enough ice cubes to reserved liquid to measure 2 cups. Add to gelatin; stir until ice is completely melted. Remove 1 cup of the gelatin; set aside at room temperature.
REFRIGERATE remaining gelatin 30 min. or until slightly thickened (consistency of unbeaten egg whites). Gently stir in chopped guava. Pour into 1-1/2-qt. serving bowl; refrigerate 10 min.
PLACE cream cheese in medium bowl. Gradually add reserved 1 cup gelatin, beating with wire whisk until well blended. Spoon over gelatin in bowl. Refrigerate at least 3 hours or until set. Top with the reserved guava shells just before serving. Store leftover dessert in refrigerator.
