Replace flag with star as used in Gmail and Thunderbird + add hover effect for flags col

skins/default/mail.css

@@ -526,6 +526,12 @@ body.messagelist
   cursor: pointer;
 }
 
+#messagelist tbody tr td.flag img:hover,
+#messagelist thead tr td.flag img
+{
+  background: url(images/icons/unflagged.png) center no-repeat;
+}
+
 #messagelist tr td.subject
 {
   overflow: hidden;
@@ -573,7 +579,7 @@ body.messagelist
 #messagelist tr.flagged td,
 #messagelist tr.flagged td a
 {
-  color: #FF0000;
+  color: #CC0000;
 }
 
 #messagelist tr.selected td

skins/default/templates/mail.html

@@ -55,7 +55,7 @@
   forwardedrepliedIcon="/images/icons/forwarded_replied.png"
   attachmentIcon="/images/icons/attachment.png"
   flaggedIcon="/images/icons/flagged.png"
-  unflaggedIcon="/images/icons/unflagged.png" />
+  unflaggedIcon="/images/blank.gif" />
 </div>
 
 <roundcube:if condition="config:preview_pane == true" />