Wafer Paper also called Rice Paper or Ostia is an edible starch based confection. It is used in cakes and also as the topping for the well-known traditional Italian and Spanish nougat.
The typical size is 8 1/2" x 11, the size of a standard piece of copy paper. Some of the products are made in Europe (Holland) while others are produced in the U.S.A. Make sure to check the manufacturers specifications if you have a preference.
The premium grade wafer paper can be used with food safe ink using a "edible printer". There is a book available that discuses the many uses for Wafer Paper Uses by Marsha Winebeckler.
Michael's sometimes stocks wafer paper. You can also find it in specialty baking shops and of course online from numerous sellers on Amazon.com: Wafer Paper