I have had the luxury of designing for DreamWorks. Although I did not design the characters I worked with a director to create designs for their swag. The director is a fan of spin off ideas from their movies and held a tight reign on how the designs turned out.
This was an idea of the art director's because it was somewhat opposite of how big and goofy Po was. It was Shifu who really held the peace which Po learned from.
The director of the DreamWorks store is always rotating designs with their logo on it.
The director wanted to make a joke out of Po having his own Noodle House because in the actual movie, he didn't want to be apart of his father's noodle dream.