Just in case anyone is looking for how to do this...
It is actually very simple.
If you wish, as I do, to put rounded corners around the 'What's New for (say) August' then...
in YOUR_TEMPLATE find 'tpl_modules_whats_new.php' in the templates folder and put the appropriate code around...
Code:
<div class="centerBoxWrapper" id="whatsNew">
<?php
require($template->get_template_dir('tpl_columnar_display.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_columnar_display.php');
?>
</div>
for example
Code:
<div id="border">
<div id="borderbot">
<div class="centerBoxWrapper" id="whatsNew">
<?php
require($template->get_template_dir('tpl_columnar_display.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_columnar_display.php');
?>
</div>
</div>
</div>
obviously this can be applied to the other pages/divs.