Arrange the Twinkies cut side up in a 13x9 inch baking dish.
If using, lay some drained mandarin oranges over Twinkies.
In a bowl, stir together the Jell-O and boiling water. When Jell-O is dissolved, put the mixture in the refrigerator to cool for 10 minutes. To hasten the process, drop in an ice cube - the extra liquid won't hurt anything.
In a large bowl, beat together the pudding mix, milk and coffee creamer for 2 minutes or until slightly thickened. Add the orange Jell-O/water mixture to the pudding mixture and stir until smooth.
Fold in two-thirds of the whipped topping. Spread the orange mixture (pour it, smooth it) over the cut Twinkies. Cover with plastic wrap and chill for 6-8 hours. Before serving, spread the remaining whipped topping over the top. Decorate thematically. *Try another fruit!