--- _display.rhtml	(revision 4811)
+++ _display.rhtml	(proposed patch)
@@ -15,7 +15,7 @@
 
 <p><%= setting_check_box :gravatar_enabled %></p>
 
-<p><%= setting_select :gravatar_default, [["Wavatars", 'wavatar'], ["Identicons", 'identicon'], ["Monster ids", 'monsterid'], ["Retro", "retro"]], :blank => :label_none %></p>
+<p><%= setting_select :gravatar_default, [["Wavatars", 'wavatar'], ["Identicons", 'identicon'], ["Monster ids", 'monsterid'], ["Retro", 'retro'], ["Mystery man", 'mm']], :blank => :label_none %></p>
 </div>
 
 <%= submit_tag l(:button_save) %>