CSS Toolkit addition: Add a message for non-subscribers

 .content:before{
     content: url(%%warning%%) " You're not subscribed to [r/subreddit](/r/subreddit) yet!";
    margin:4px;
    color:#2e2e2e;
    }

 .subscriber .content:before{
    content: " " !important;
    }

.side .content:before {
        content: " " !important
        }

edit: image used http://c.thumbs.redditmedia.com/2JbvJJhbv9YODq_z.png

edit 2: fixed for sidebar