プラグイン要らずでカスタマイズ自由。
functions.phpでadd_theme_support( 'post-thumbnails' );入れておかないと動かないけど
<div>
<p align="center">★記事</p>
<table align="center">
<tbody>
<?php
$post_id = get_the_ID();
$newposts = get_posts( array(
'category_name' => 'カテゴリ名',
'posts_per_page' => 3,
'exclude' => $post_id ));
foreach( $newposts as $post ):
echo '<tr>';
setup_postdata( $post );
$new_title = get_the_title($post);
echo '<td>';
if(has_post_thumbnail($post->ID)) {
$img = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),large);
echo "<img src='{$img[0]}' alt='' height='90'>";
}
echo '</td>';
echo '<td width="16px">';
echo '</td>';
echo '<td valign="top">';
echo "<a href='" . get_permalink($post) . "'>";
echo "{$new_title} <span style='font-size:13px'>(" . get_post_time('Y.m.d',false,$post) . ")</span>";
echo '</a>';
echo '</td>';
echo '</tr>';
endforeach;
wp_reset_postdata();
?>
</tbody>
</table>
</div>ネタ元