Xbox Design Lab allows you to create a custom colored Xbox One controller. It’s been around for about a year, but now they have a new contest called “Originals.”
With originals, you can customize a controller as normal then claim the design. If people buy your design, you’ll be entered to win fabulous prizes.
Mine’s titled Astro banana
Most of Microsoft’s promotions are US only, and unfortunately, this one is no different.
Edit to add link oops- https://www.xboxdesignlaboriginals.com