In small saucepan, soften gelatin in lime juice 5 minutes. Blend in sugar and eggs. Over medium heat, bring mixture to a boil. Reduce heat. Boil gently 3 minutes, stirring constantly. In small bowl, combine cream cheese and butter; beat well. Pour in hot lime juice mixture; beat until smooth and well blended. Refrigerate until cool, about 45 minutes, stirring occasionally. In medium bowl, beat 1 cup whipping cream until stiff peaks form. Fold in cooled lime juice mixture and lime peel. Spoon into cooled pie crusts. Refrigerate until firm, about 2 hours. Garnish with whipped cream and lime slices. Store in refrigerator.