Spinning sun + nothing for command mode.

IPython/html/static/notebook/js/notificationarea.js

@@ -86,12 +86,12 b' var IPython = (function (IPython) {'
         // Kernel events
         $([IPython.events]).on('status_idle.Kernel',function () {
             IPython.save_widget.update_document_title();
-            $kernel_ind_icon.attr('class','icon-circle-blank').attr('title','Kernel Idle');
+            $kernel_ind_icon.attr('class','').attr('title','Kernel Idle');
         });
 
         $([IPython.events]).on('status_busy.Kernel',function () {
             window.document.title='(Busy) '+window.document.title;
-            $kernel_ind_icon.attr('class','icon-circle').attr('title','Kernel Busy');
+            $kernel_ind_icon.attr('class','icon-sun icon-spin').attr('title','Kernel Busy');
         });
 
         $([IPython.events]).on('status_restarting.Kernel',function () {

IPython/html/static/notebook/less/notificationarea.less

@@ -8,6 +8,7 b''
     margin: 0px;
     width: 11px;
     z-index: 10;
+    text-align: center;
 }
 
 #kernel_indicator {

IPython/html/static/style/style.min.css

@@ -1502,7 +1502,7 b' p{margin-bottom:0}'
 i.menu-icon{padding-top:4px}
 ul#help_menu li a{overflow:hidden;padding-right:2.2em}ul#help_menu li a i{margin-right:-1.2em}
 #notification_area{z-index:10}
-.indicator_area{color:#777;padding:4px 3px;margin:0;width:11px;z-index:10}
+.indicator_area{color:#777;padding:4px 3px;margin:0;width:11px;z-index:10;text-align:center}
 #kernel_indicator{margin-right:-16px}
 .notification_widget{color:#777;padding:1px 12px;margin:2px 4px;z-index:10;border:1px solid #ccc;border-radius:4px;background:rgba(240,240,240,0.5)}.notification_widget.span{padding-right:2px}
 div#pager_splitter{height:8px}