Add boiling water to jelly powder in large bowl; stir 2 min. until completely dissolved. Add enough ice to cold water to measure 1 cup. Add to jelly; stir until melted. Whisk in Cool Whip
, lime zest and juice. Refrigerate 15 min. or until thick enough to mound. Meanwhile, mix graham crumbs and margarine; press onto bottom and up side of 9-inch pie plate.