Make sure to get an official one, most third party controllers aren't that good.
You can decide how easy or hard your mod can be. While my controller may be cool, it's better if it suits what you like, which is why I have a list of other mods that I've seen, so you can customize your controller even further. I also suggest to try to make your controller different. I highly suggest reading though it, and checking the images for extra info. I'll walk you through how I made this custom controller, and suggest some extra mods to do at the end. Not to mention too, it's really easy to get it working on PC. tournament and there's bound to be people with their modded controllers. Luckily for us, the Gamecube controller is one of the most modded, and supported controllers out there, look in any Super Smash Bros. Custom buttons, sticks, and LEDs, sure why not. None of which are really unique to each person, so what are you to do? Mod it. Gamecube controllers are my favorite types of controllers, but in North America, the three most common colours of them are Platinum, Black and Indigo colours. Have you ever had a game controller that you really loved, but wasn't personalized for you? Well that's how I felt with my Gamecube controller.