This module create style content , allow add class for region panel

mod_panel_style_mod_panel_style.info

name = Mod Panel Style
description = Module support Style for Panel region
dependencies[] = panels
core = 7.x
version = 1.0

mod_panel_style_mod_panel_style.module

<?php

/**
 * Implements hook_ctools_plugin_directory().
 */
function mod_panel_style_ctools_plugin_directory($module, $plugin)
{
   if($module == 'page_manager' || $module  == 'panels')
   {
       return 'plugins/'.$plugin;
   }
}

mod_panel_style_plugins_styles_jv_style_jv-region.tpl.php

<?php
drupal_add_css(drupal_get_path('module','mod_panel_style') .'/plugins/styles/mod_panel_style/mod_panel_style.css', array('group' => CSS_DEFAULT, 'every_page' => TRUE)); ?>
<div class="example-region">
    <?php print render($content); ?>
    <?php //print render($content->content); ?>
</div>

mod_panel_style_plugins_styles_jv_style_jv_style.css

.example-pane .blue {color:blue;}
.example-pane .green {color:green;}

mod_panel_style_plugins_styles_jv_style_jv_style.inc

<?php

$plugin = array(
    'jv_style' => array(
        'title' => t('JV Style'),
        'description' => t('Follow add class into panel region'),
        'render region' => 'jv_render_region',
        'pane settings form' => 'jv_settings_form',
        'settings form' => 'jv_settings_form',
        'hook theme' => array(
            'jv_style_region' => array(
                'template' => 'jv-region',
                'path' => drupal_get_path('module','mod_panel_style').'/plugins/styles/jv_style',
                'variables' => array(
                    'content' => NULL,
                    'class' => NULL,
                ),
            ),
        ),

    )
);

function theme_jv_render_region($vars) {
    $content = '';

    foreach ($vars['panes'] as $pane_id => $pane_output) {

        $content .= $pane_output;
    }
    if (empty($content)) {
        return;
    }
    krumo($vars);
    return theme('jv_style_region', array('content' => $content));
}

function jv_settings_form($style_settings) {

    $form['jv_class'] = array(
        '#type' => 'textfield',
        '#title' => t('Add Class Region'),
        '#description' => t('add class for region output'),
        '#default_value' => (isset($style_settings['jv_class'])) ? $style_settings['jv_class'] : ''
    );

    return $form;
}

mod_panel_style_plugins_styles_jv_style_jv_style.php

<?php
drupal_add_css(drupal_get_path('module','mod_panel_style') .'/plugins/styles/mod_panel_style/mod_panel_style.css', array('group' => CSS_DEFAULT, 'every_page' => TRUE)); ?>
<div class="example-pane">
    <?php if (isset($content->title)): ?>
        <h2 class="pane-title <?php print (isset($settings['top_color'])) ? $settings['top_color'] : 'blue'; ?>"><?php print $content->title; ?></h2>
    <?php endif ?>
    <div class="pane-content">
        <?php print render($content->content); ?>
    </div>
</div>