Add brand colors to the gutenberg color picker.

brand-colors-snippet.php

<?php
function ej_add_theme_colors_to_gutenberg()
{
  add_theme_support('editor-color-palette', array(
    array(
      'name' => esc_attr__('AWD Orange Red', 'EricJohnson'), //brand color
      'slug' => 'awd-orange-red',
      'color' => '#f94341',
    ),
    array(
      'name' => esc_attr__('AWD Grey', 'EricJohnson'), //brand color
      'slug' => 'awd-grey',
      'color' => '#414141',
    ),
    array(
      'name' => esc_attr__('Black', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'black',
      'color' => '#000000',
    ),
    array(
      'name' => esc_attr__('Cyan bluish gray', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'cyan-bluish-gray',
      'color' => '#abb8c3',
    ),
    array(
      'name' => esc_attr__('White', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'white',
      'color' => '#ffffff',
    ),
    array(
      'name' => esc_attr__('Pale pink', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'pale-pink',
      'color' => '#f78da7',
    ),
    array(
      'name' => esc_attr__('Vivid red', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'vivid-red',
      'color' => '#cf2e2e',
    ),
    array(
      'name' => esc_attr__('Luminous vivid orange', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'luminous-vivid-orange',
      'color' => '#ff6900',
    ),
    array(
      'name' => esc_attr__('Luminous vivid amber', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'luminous-vivid-amber',
      'color' => '#fcb900',
    ),
    array(
      'name' => esc_attr__('Light green cyan', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'light-green-cyan',
      'color' => '#7bdcb5',
    ),
    array(
      'name' => esc_attr__('Vivid green cyan', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'vivid-green-cyan',
      'color' => '#00d084',
    ),
    array(
      'name' => esc_attr__('Pale cyan blue', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'pale-cyan-blue',
      'color' => '#8ed1fc',
    ),
    array(
      'name' => esc_attr__('Vivid cyan blue', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'vivid-cyan-blue',
      'color' => '#0693e3',
    ),
    array(
      'name' => esc_attr__('Vivid purple', 'EricJohnson'), //Default Gutenberg Color
      'slug' => 'vivid-purple',
      'color' => '#9b51e0',
    ),
  ));
}

add_action('after_setup_theme', 'ej_add_theme_colors_to_gutenberg'); //Fire it off!