Just to add to svtorres post, here's my paymentprocessing.tpl. The only disadvantage i've found is that the func_flush(); causes the "If the page doesn't refresh.." message to appear outside this new tpl, and consequently looks a bit odd when the page refreshes.
All i've included is a single gif, a link to the css and moved the text into some lang vars;
Code:
{config_load file="$skin_config"}
<HTML>
<HEAD>
<TITLE>{$lng.txt_wait_title}</TITLE>
<LINK rel="stylesheet" href="{$SkinDir}/{#CSSFile#}">
</HEAD>
<BODY>
<table width="566" border="0" cellspacing="0" cellpadding="0">
<tr>
<td colspan="4"></td>
</tr>
<tr>
<td width="25"></td>
<td width="53">[img]{$ImagesDir}/wait_clock.gif[/img]</td>
<td width="459" class="mainheading">{$lng.txt_order_wait}</td>
<td width="29"></td>
</tr>
<tr>
<td colspan="4"></td>
</tr>
</table>
</BODY>
</HTML>
I'll add a post about this in the wishlist forum, to see what the commuinity think about this (or something similar) being in the next core XC release.
Cheers,