In a bowl, dissolve lime gelatin in 1 cup boiling water. Add 1 cup cold water; stir. Pour into a 9� x 9� x 2� dish coated with nonstick cooking spray. Refrigerate until almost set, about 2 hours.
In a bowl, dissolve lemon gelatin in 1/2 cup boiling water; whisk in cream cheese until smooth. Stir in pineapple and pecans. Fold in whipped topping; Spoon over first layer. Refrigerate until firm, about 1 hour.
In a bowl, dissolve cherry gelatin in remaining boiling water. Add remaining cold water; stir. Chill until syrupy and slightly thickened. Carefully spoon over second layer. Refrigerate until set, about 4 hours.