From the United Kingdom with love, the BentoBox Arcade Pad features Kailh Choc V2 switches, RGB LED, and the capability of custom art.
This addon for the Legends Pinball machine by AtGames can also be used as a standalone PC arcade stick if desired.
This controller can be ordered in several colors, whether that is for the enclosure or the keycaps. It is also available in WASD format.
The SYGBox by SaveYourGames is a 3D printed controller that lets you choose button and cable colors as well as the PCB.
This dynamite of an artisan arcade stick has been in the making for 20 years and features Seimitsu parts backed by a Daemonbite encoder.
BorgTech's Super Smash Bros box controller offers a variety of keycap colors as well as Kailh Speed Bronze or Gateron Silver Pro switches.
Retro Stockpile offers enclosures in the leverless & fightstick formats that can also come preassembled with buttons and other parts.
The Mavercade Heavyweight is the Francis Ngannou of fightsticks—as it allows you to throw punches with some weight!