ARRANGE ladyfingers (with an inch cut from bottom of each cookie) around side of 9-in. springform pan; place remaining ladyfingers on bottom of pan. Set aside.
PREPARE lemon jelly powder as directed on package for 30 minute set method, using 3/4 cup of the boiling water. Remove unmelted ice cubes. Fold in 1 cup of the whipped topping until smooth and well blended. Gently pour over ladyfingers in pan. Refrigerate 30 min. or until set.
MEANWHILE, prepare cranberry jelly powder as directed on package for 30 minute set method, using remaining 3/4 cup boiling water. Remove unmelted ice cubes. Fold in remaining cup whipped topping. Gently spoon prepared cranberry mixture over set lemon layer.
REFRIGERATE 4 hours or overnight until firmly set and ready to serve. Remove from pan. Garnish with sugar frosted cranberries and lemon slices, if desired.
serving size = 1/12 recipe