Add 1 cup boiling water to strawberry gelatin mix in medium bowl; stir 2 min. until dissolved. Cool slightly.
Meanwhile, sprinkle unflavored gelatine over cold water in separate medium bowl; let stand 1 min. Add remaining boiling water; stir until gelatine is completely dissolved. Stir in milk and extract. Spoon 2 Tbsp. creamy gelatine mixture into each of 6 dessert glasses. Refrigerate 15 min. or until gelatine is set but not firm. Let remaining gelatine mixture stand at room temperature until ready to use.
Spoon 1-1/2 Tbsp. strawberry gelatin over creamy gelatine layer in each dessert glass. Refrigerate 15 min. or until strawberry gelatin layers are set but not firm. Meanwhile, let remaining strawberry gelatin stand at room temperature until ready to use.
Repeat layers, in alternating colors, to use remaining creamy gelatine and strawberry gelatin, refrigerating 15 min. after each strawberry layer. Refrigerate finished parfaits 1 hour or until all layers are firm.
Top with COOL WHIP and crushed mints just before serving.