This snippet customize the colors of WP theme

color_customizer.php

<?php
// WORDPRESS 3.4 THEME OPTIONS
add_action( 'customize_register', 'hg_customize_register' );
function hg_customize_register($wp_customize)
{
  $colors = array();
  $colors[] = array( 'slug'=>'content_bg_color', 'default' => '#ffffff', 'label' => __( 'Content Background Color', 'YOUR_THEME_NAME' ) );
  $colors[] = array( 'slug'=>'content_text_color', 'default' => '#000000', 'label' => __( 'Content Text Color', 'YOUR_THEME_NAME' ) );

  foreach($colors as $color)
  {
    // SETTINGS
    $wp_customize->add_setting( $color['slug'], array('default' => $color['default'], 'type' => 'option', 'capability' => 'edit_theme_options' ));

    // CONTROLS
    $wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, $color['slug'], array( 'label' => $color['label'], 'section' => 'colors', 'settings' => $color['slug'] )));
  }
}



function hex2rgb($hex) {
   $hex = str_replace("#", "", $hex);

   if(strlen($hex) == 3) {
      $r = hexdec(substr($hex,0,1).substr($hex,0,1));
      $g = hexdec(substr($hex,1,1).substr($hex,1,1));
      $b = hexdec(substr($hex,2,1).substr($hex,2,1));
   } else {
      $r = hexdec(substr($hex,0,2));
      $g = hexdec(substr($hex,2,2));
      $b = hexdec(substr($hex,4,2));
   }
   $rgb = array($r, $g, $b);
   //return implode(",", $rgb); // returns the rgb values separated by commas
   return $rgb; // returns an array with the rgb values
}