Cook pasta according to package directions. Drain. Stir in pudding mix.
Drain the peaches, reserving 1/2 cup syrup; stir reserved syrup into pasta mixture. Cut peach slices into bite-size pieces. Fold the peaches and Mandarin oranges into pasta mixture. Cover; chill about 2 hours.
Just before serving, fold in the whipped dessert topping. Serves 15.
Follow recipe as directed, except substitute one 20-ounce can of either juice-pack crushed pineapple, pineapple tidbits, or chunks for the peaches and use 1/2 cup of pineapple juice for the peach syrup.