I can't leave it alone.

I noticed at the PHP calendar block the compressed bar with the month name. This is caused by a fixed declared height of 31 pixels in line 754 following for "h2.category_header, ...". This is due to the graphical gradient in the default SMF themes. But with the CSS gradients used by ELK this is no longer necessary. So I reduced "h2.category_header, ..." to the most necessary ("overflow: hidden;").
While briefly skimming other layout abnormalities, I came across quite a few padding with exactly one percent. Should better be changed to .3em to .5em. That way the margin depends on the font and not on the screen width.
In this context I also changed the function template_categories() to a tableless layout.

// Article Categories page
function template_categories()
{
global $context, $settings, $options, $txt, $scripturl, $modSettings, $boarddir, $boardurl, $language;
echo '
<form accept-charset="', 'UTF-8', '" name="tpadmin_news" action="' . $scripturl . '?action=admin;area=tparticles;sa=newcategory" method="post" enctype="multipart/form-data" onsubmit="syncTextarea();">
<input type="hidden" name="sc" value="', $context['session_id'], '" />
<input type="hidden" name="tpadmin_form" value="categories">
<div class="cat_bar">
<header class="category_header">
<div class="floatleft">' . $txt['tp-artcat'] . '</div>
<div class="floatright150 centertext">' , $txt['tp-actions'] , '</div>
</header>
</div>
<section id="edit-category" class="admintable admin-area">
<div class="information smalltext">' , $txt['tp-helpcats'] , '</div>';
if(isset($context['TPortal']['editcats']) && count($context['TPortal']['editcats'])>0)
{
$alt=true;
foreach($context['TPortal']['editcats'] as $c => $cat)
{
echo '
<div class="content padding-div">
<div class="floatleft">
' , str_repeat("- ",$cat['indent']) , '
<a href="' . $scripturl . '?action=admin;area=tparticles;sa=categories;cu='.$cat['id'].'" title="' .$txt['tp-editcategory']. '">' , $cat['name'] , '</a>
' , isset($context['TPortal']['cats_count'][$cat['id']]) ? '(' . ($context['TPortal']['cats_count'][$cat['id']]>1 ? $txt['tp-articles'] : $txt['tp-article']) . ': '.$context['TPortal']['cats_count'][$cat['id']].')' : '' , '
</div>
<div class="floatright150 centertext">
<a href="' . $scripturl . '?cat=' . $cat['id'] . '" title="' . $txt['tp-viewcategory'] . '"><img src="' . $settings['tp_images_url'] . '/TPfilter.png" alt="" /></a>
<a href="' . $scripturl . '?action=admin;area=tparticles;sa=categories;cu='.$cat['id'].'" title="' .$txt['tp-editcategory']. '"><img src="' . $settings['tp_images_url'] . '/TPconfig_sm.png" alt="" /></a>
<a href="' . $scripturl . '?action=admin;area=tparticles;sa=newcategory;child;cu=' . $cat['id'] . '" title="' . $txt['tp-addsubcategory'] . '"><img src="' . $settings['tp_images_url'] . '/TPadd.png" alt="" /></a>
<a href="' . $scripturl . '?action=admin;area=tparticles;sa=newcategory;copy;cu=' . $cat['id'] . '" title="' . $txt['tp-copycategory'] . '"><img src="' . $settings['tp_images_url'] . '/TPcopy.png" alt="" /></a>
<a href="' . $scripturl . '?action=admin;area=tparticles;sa=delcategory;id='.$cat['id'].';' . $context['session_var'] . '=' . $context['session_id'] . '" onclick="javascript:return confirm(\''.$txt['tp-confirmcat1'].' \n'.$txt['tp-confirmcat2'].'\')" title="' . $txt['tp-delete'] . '"><img src="' . $settings['tp_images_url'] . '/TPdelete2.png" alt="" /></a>
</div>
</div>';
$alt = !$alt;
}
}
echo '
</div>
</section>
</form>';
}
In addition still a little CSS extended:
.floatright150 {
float: right;
min-width: 150px;
width: 20%;
}
Just had a look at the index.css of ELK an changed a little bit. Some declarations were redundant.