I use this
Code:
<table width="90%" cellspacing="1" cellpadding="3" border="0" align="center">
<tr>
<td style="background-color:#FF0000;" rowspan="2" align="middle" vAlign="center" width="1%">
<span style="font-weight:bold; font-family:Times New Roman, Verdana; font-size: 32px; color: #FFFF00;" title=""> ! </span>
</td>
<td><span style="color:#FFFF00; line-height:125%; background-color:#FF0000;"><b>This is a moderator message from: {option}</b></span></td>
</tr>
<tr>
<td style="color:#FFFF00; line-height:125%; background-color:#FF0000;">{param}</td>
</tr>
</table>
I enable option so that the moderator can also place their name. This is red background with yellow text. Which makes it stand out on ANY Forums. It also uses a large exclamation text font vs an image.