The Glyph is a modular all-button controller that is available in layouts for games from Smash to Street Fighter.
The Neobox Core0 is a slim acrylic all-button controller that is here in order to serve your need for RGB LEDs.
The G series of Haute42 controllers can come in 16, 13, or 12 button editions in order to cater to your needs.
Donte Wilson is your guy if you are looking for stickless wooden controllers that have stylish button LED.
The RaidenBox is a mini all-button controller that is made of acrylic & nylon and is inspired by the Flatbox & Snack Box Micro.
The Steelbox is a mini stickless controller that has 14 buttons and switches, with the jump button being bigger than the rest.
The Paragon is a wooden stickless controller that has its own layout (unless you choose the standard layout).
The Caster Acrylic & Resin Fightstick DIY Enclosure by Raw Super Arcade comes in Vewlix, Noir, all button, and other layouts.