If this is a family project perhaps you could have your children draw a picture and scan that into your computer and add it as a graphic onto your dvd insert to print and once you add some writing you find that it looks rather nice and is very unique to your family. If you are a company you may have a training video need a dvd case cover printed for. If you have large quantities you can find a dvd case insert printers or cd case cover printers. They can get your job done quickly and affordable.
What about a business that has services to offer and they want to put a dvd in their promotional packages. This is an excellent use of dvd inserts. Small quantities of dvd insert printing can be done in-house and mass quantities can be done by a dvd printing service.