There's not enough data here to call it a case study, but I like seeing the form experimentation. These desktop chargers are by industrial design consultancy Swerve.

"Over the past few years Swerve have designed an array of charging devices for the home and work place for the Visual Charge line. Utilizing the breakthrough battery level indicators, the products allow for fast and convenient charging of multiple devices, with the simultaneous powering of other equipment and products."

"Swerve designed each product as a stylish and exciting complement to the consumer's devices. Combining elegant surfaces and finishes with unique and adaptive functionality. Each product has been launched to great success and the line continues to grow with new products planned for the home and office."

You can see more of Swerve's work here.