IT isn’t the familiar Adidas look — that bold and basic three-stripe logo. Instead, it’s a design meant to evoke blowing wind, flowing water and flapping wings.

An employee examines football boots at the final check of the factory of German sporting-goods maker Adidas AG in Scheinfeld, Germany.

The tricked-out design for new T-shirts in China was created by Chen Leiying, a 27-year-old artist known as Shadow Chen who lives in the coastal city of Ningbo. She is not even an employee of the company, but multinationals like Adidas are beginning to turn to young creative types like her to dream up images and logos for the under-30 set in China, a group that is 500 million strong.