When you feels its time to change it with your own pictures, here I got the code. Please copy paste it on your About Me widget.
<script language="javascript" type="text/javascript">
x=banneradrow.getElementsByTagName("td")[0];
x.innerHTML="<center><img src='Your Picture Address Here' border='0'></img></center>";
</script>
x=banneradrow.getElementsByTagName("td")[0];
x.innerHTML="<center><img src='Your Picture Address Here' border='0'></img></center>";
</script>
All that you need is just replace that green text with your uploaded image address. If you just want a simple way, you can choose to search your desire picture on Google.
Last step, you should paste this code in your About Me widget, That I had posted couple days ago.
