You could extend this to have a textured background on the banner as well -
Code:
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="background: White url(/path/to/your/texture.gif); border: 1px solid Black; padding: 1px;"><normalfont>{param}</normalfont></td>
</tr>
<tr><td align="center">
<img src="absolut/path/to/your/image.gif" alt="" border="0">
</td></tr>
</table>