Grid-a-licious amendments!

Any ideas?
This is where i got it from:
https://suprb.com/grid-a-licious/

I can provide the code for any of these sections if it helps:
Comments (comments.php)
Footer (footer.php)
Header (header.php)
Main Index Template (index.php)
Page Template (page.php)
Single Post (single.php)

I guess it’s all about stripping everything but the image itself, right?

Something like this might work: (haven’t tested it!)

index.php

<?php get_header(); ?>

<div class="navigation_group">
	<?php next_posts_link('<div class="eachpost "><div>&mdash;Older</div></div>') ?>
	<?php previous_posts_link('<div class="eachpost "><div>Newer&mdash;</div></div>') ?>
</div>

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
	<?php 

			$upload_path = get_option( 'upload_path' );
			$upload_path = trim($upload_path);

			$img_full_url = post_image();

			if ($img_full_url != "") {	

			$temp = substr(strrchr($upload_path, "/"), 1);

			list($url, $filename) = explode($temp, $img_full_url);

			$img_url = $upload_path . "/" . $filename;

			$imagesize = getimagesize($img_url);
			list($width, $height, $type, $attr) = getimagesize($img_url);
			$theClass = "eachpost ";
			if ( $width < "440" ) { $new_width = "200"; $theClass = "eachpost "; }
				else if ( $width < "660" ) { $new_width = "430"; $theClass = "eachpost twocols"; }
					else { $new_width = "660"; $theClass = "eachpost threecols"; }

			$new_height = ($height*$new_width)/$width;
			echo '<div class="'.$theClass.'">
					<div><a href="<?php the_permalink() ?>" rel="bookmark">'; ?>

			<?php echo '<img src="' . $img_full_url . '" width="' . $new_width . '" height="' . $new_height . '" /></a>'; } ?>			

  	 </div>
  </div> 

    <?php if ( comments_open() ) comments_template(); ?>

<?php endwhile; else: ?>
<div class="warning">
	<p>Sorry, but you are looking for something that isn't here.</p>
</div>
<?php endif; ?>

<div class="navigation_group">
	<?php next_posts_link('<div class="eachpost "><div>&mdash;Older</div></div>') ?>
	<?php previous_posts_link('<div class="eachpost "><div>Newer&mdash;</div></div>') ?>
</div>

    <?php get_footer(); ?>