So you would like to make your Apple Watch look unique? Why not 3D print a custom flexible band for it? Adafruit has shared a guide that shows you how to do just that. The goal of this project is to learn about 3D printing with flexible filaments.
Ninjaflex is a thermoplastic polyurethane filament that can be printed using FDM style desktop 3D printers. You are going to need Apple Watch connectors to complete this project.