You said it was "own design", not "original design", not that I know the difference between the two, but IMHO "own design" fits what you did, while "original design" **might** be interpreted as something not made up of standard blocks, such as medallions and pinwheels. It's too bad the judge didn't clarify. And another judge might have had an entirely different opinion. All you can really do is read the rules that are provided for each category (they aren't always easy to interpret) and put the quilt where you think it fits. Congratulations on your ribbon!