Powerful tool for "Bulletproof Email Background Images" (VML for Outlook 2007/2010/2013, and HTML/CSS for Outlook 2000/2003, Gmail, Hotmail...)
as an exemple :
<div style="background-color:#f6f6f6;">
<!--[if gte mso 9]>
<v:background xmlns:v="urn:schemas-microsoft-com:vml" fill="t">
<v:fill type="tile" src="http://i.imgur.com/n8Q6f.png" color="#f6f6f6"/>
</v:background>
<![endif]-->
<table height="100%" width="100%" cellpadding="0" cellspacing="0" border="0">
<tr>
<td valign="top" align="left" background="http://i.imgur.com/n8Q6f.png">
</td>
</tr>
</table>
</div>
in order to have the specified background image to Full email body.
This link help to use the Vector Markup Language (VML)