diff --git a/themes/seven/style.css b/themes/seven/style.css
index c52d661..ac90ab2 100644
--- a/themes/seven/style.css
+++ b/themes/seven/style.css
@@ -575,11 +575,11 @@ html.js fieldset.collapsed {
   border-width: 1px;
   height: auto;
 }
-fieldset fieldset {
-  background-color: #fff;
+fieldset.fieldset-nested-odd {
+  background-color: #ffffff;
 }
-fieldset fieldset fieldset {
-  background-color: #f8f8f8;
+fieldset.fieldset-nested-even {
+  background-color: #f7f7f3;
 }
 
 /**
diff --git a/themes/seven/template.php b/themes/seven/template.php
index 5c086fa..48e9558 100644
--- a/themes/seven/template.php
+++ b/themes/seven/template.php
@@ -1,6 +1,11 @@
 <?php
 
 /**
+ * @file
+ * Customizes theme templates and elements.
+ */
+
+/**
  * Override or insert variables into the maintenance page template.
  */
 function seven_preprocess_maintenance_page(&$vars) {
@@ -17,11 +22,32 @@ function seven_preprocess_maintenance_page(&$vars) {
  */
 function seven_preprocess_html(&$vars) {
   // Add conditional CSS for IE8 and below.
-  drupal_add_css(path_to_theme() . '/ie.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 8', '!IE' => FALSE), 'weight' => 999, 'preprocess' => FALSE));
+  drupal_add_css(path_to_theme() . '/ie.css', array(
+    'group' => CSS_THEME,
+    'browsers' => array(
+      'IE' => 'lte IE 8',
+      '!IE' => FALSE),
+    'weight' => 999,
+    'preprocess' => FALSE)
+  );
   // Add conditional CSS for IE7 and below.
-  drupal_add_css(path_to_theme() . '/ie7.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 7', '!IE' => FALSE), 'weight' => 999, 'preprocess' => FALSE));
+  drupal_add_css(path_to_theme() . '/ie7.css', array(
+    'group' => CSS_THEME,
+    'browsers' => array(
+      'IE' => 'lte IE 7',
+      '!IE' => FALSE),
+    'weight' => 999,
+    'preprocess' => FALSE)
+  );
   // Add conditional CSS for IE6.
-  drupal_add_css(path_to_theme() . '/ie6.css', array('group' => CSS_THEME, 'browsers' => array('IE' => 'lte IE 6', '!IE' => FALSE), 'weight' => 999, 'preprocess' => FALSE));
+  drupal_add_css(path_to_theme() . '/ie6.css', array(
+    'group' => CSS_THEME,
+    'browsers' => array(
+      'IE' => 'lte IE 6',
+      '!IE' => FALSE),
+    'weight' => 999,
+    'preprocess' => FALSE)
+  );
 }
 
 /**
@@ -116,3 +142,34 @@ function seven_css_alter(&$css) {
     $css['misc/ui/jquery.ui.theme.css']['type'] = 'file';
   }
 }
+
+/**
+ * Override of theme_fieldset().
+ *
+ * Added odd/even classes for more fieldset theming options.
+ */
+function seven_fieldset($variables) {
+  $element = $variables['element'];
+  element_set_attributes($element, array('id'));
+
+  $no_of_parents = count($element['#parents']) - 1;
+  $additional_class = ($no_of_parents % 2 == 0) ? 'fieldset-nested-even' : 'fieldset-nested-odd';
+  _form_set_class($element, array('form-wrapper', $additional_class));
+
+  $output = '<fieldset' . drupal_attributes($element['#attributes']) . '>';
+  if (!empty($element['#title'])) {
+    // Always wrap fieldset legends in a SPAN for CSS positioning.
+    $output .= '<legend><span class="fieldset-legend">' . $element['#title'] . '</span></legend>';
+  }
+  $output .= '<div class="fieldset-wrapper">';
+  if (!empty($element['#description'])) {
+    $output .= '<div class="fieldset-description">' . $element['#description'] . '</div>';
+  }
+  $output .= $element['#children'];
+  if (isset($element['#value'])) {
+    $output .= $element['#value'];
+  }
+  $output .= '</div>';
+  $output .= "</fieldset>\n";
+  return $output;
+}