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//Change the Customizer color palette presets
add_action('customize_controls_print_footer_scripts', function () {
    ?>
  <script>
    jQuery(document).ready(function($){
      $('.wp-picker-container').iris({
        mode: 'hsl',
        controls: { 
          horiz: 'h', // square horizontal displays hue
          vert: 's', // square vertical displays saturdation
          strip: 'l' // slider displays lightness
        },
 \!h       palettes: ['#91472c', '#6d775f', '#f9fffb', '#546a76']  //add the hex codes to the colors you want in the palette
      })
    });
  </script>
  <?php
});