If you want it that badly, use Stylish
Code:
#logo img {
background-image: url("styles/default/xenforo/newerbanana.png");
padding-left: 798px;
width: 798px;
height: 103px;
box-sizing: border-box;
-moz-box-sizing: border-box;
}
AND YES THE PICTURE IS STILL ON THE SERVER EVEN THOUGH IT WAS TEMPORARY