functions.php

<?php
/**
 * Add BB colour presets into tinymce presets.
 * @since Forever
 */
add_filter( 'tiny_mce_before_init', function( $init ) {
	$default_colours = '"000000", "Black","993300", "Burnt orange","333300", "Dark olive","003300", "Dark green","003366", "Dark azure","000080", "Navy Blue","333399", "Indigo","333333", "Very dark gray","800000", "Maroon","FF6600", "Orange","808000", "Olive","008000", "Green","008080", "Teal","0000FF", "Blue","666699", "Grayish blue","808080", "Gray","FF0000", "Red","FF9900", "Amber","99CC00", "Yellow green","339966", "Sea green","33CCCC", "Turquoise","3366FF", "Royal blue","800080", "Purple","999999", "Medium gray","FF00FF", "Magenta","FFCC00", "Gold","FFFF00", "Yellow","00FF00", "Lime","00FFFF", "Aqua","00CCFF", "Sky blue","993366", "Red violet","FFFFFF", "White","FF99CC", "Pink","FFCC99", "Peach","FFFF99", "Light yellow","CCFFCC", "Pale green","CCFFFF", "Pale cyan","99CCFF", "Light sky blue","CC99FF", "Plum"';
	$colours         = FLBuilderModel::get_color_presets();
	$custom_colours  = '';

	if ( ! empty( $colours ) ) {
		$custom_colours  = '"","",';
		foreach ( $colours as $k => $colour ) {
			$custom_colours .= sprintf( '"%s", "Custom %s",', ltrim( $colour, '#' ), $k + 1 );
		}
	} else {
		$custom_colours = '""';
	}

	// build colour grid default+custom colors
	$init['textcolor_map'] = '[' . $default_colours . ',' . rtrim( $custom_colours, ',' ) . ']';

	// enable 6th row for custom colours in grid
	$init['textcolor_rows'] = 8;
	return $init;
});