diff --git a/wiki/static/crans/css/crans.css b/wiki/static/crans/css/crans.css
index 4ce81fd8..ee9584ba 100644
--- a/wiki/static/crans/css/crans.css
+++ b/wiki/static/crans/css/crans.css
@@ -34,8 +34,13 @@ div#titleBarre {
     border-bottom: thin solid #f9821d;//orange;
     background: #f9821d url(../img/BarreOrange.png) repeat-x;
 }
+
 /* on change la couleur des soulignements de titres pour aller avec la barre */
 h1, h2, h3, h4, h5, h6 {border-color: #f9821d}
 div#titleBarre *,
 div#titleBarre h1#title a  { color: white; }
 h1#title { background: url(../img/BarreLogo.png) no-repeat right top;}
+/* variantes */
+.halloween h1#title {
+    background-image: url(../img/barreLogoHalloween.png);
+}
diff --git a/wiki/theme/crans.py b/wiki/theme/crans.py
index 100da812..af758c2e 100644
--- a/wiki/theme/crans.py
+++ b/wiki/theme/crans.py
@@ -7,7 +7,7 @@
     Adapted for CR@NS by Nicolas Salles <salles AT crans DOT org>
     @license: GNU GPL, see COPYING for details.
 """
-
+import datetime
 from MoinMoin.theme import ThemeBase
 from MoinMoin import wikiutil, i18n
 from MoinMoin.Page import Page
@@ -39,9 +39,15 @@ class ThemeCrans(ThemeBase):
         until the footer.  This keeps the HTML cleaner and more accessible,
         making sure the main content arrives first.
         """
+        if datetime.date.today().month == 10:
+            extra_style = " class=\"halloween\""
+        elif (datetime.date.today().month == 12) and (datetime.date.today().day <= 24):
+            extra_style = " class=\"noel\""
+        else:
+            extra_style = ""
         parent = d['page'].getParentPage()
         html = [
-            u'<div id="globalWrapper">',
+            u'<div id="globalWrapper"%s>' % extra_style,
             u'<div id="main-content">',
             u'<div id="titleBarre">',
             '<h1 id="title">',