Cool 'n' Easy Pie

2/3 cup boiling water 1 pkg (4-serving size) gelatin,any flavor 1/2 cup cold juice, any flavor Ice cubes 1 tub(8oz) whipped topping.thawed 1 prepared graham cracker crumb crust(6oz) Assorted fruit(optional)  Stir boiling water into gelatin in large bowl 2 min or until completely dissolved. Mix cold juice and ice to make 1 cup. Add to gelatin, stirring until slightly thickened. Remove any remaining ice.  Stir in whipped topping with wire wisk intil smooth. Refrigerate 10-15 min or until mixture is very thick and will mound. Spoon into crust. Refrigerate 4 hours or until firm. Just before serving, garnish with fruit, if desired. Store leftover pie in refrigerator. Makes 8 servings