I have a theme that I wanted to change the display of my categories to full page instead of the two columns which it displays now. I have included the category php to my theme here. Thanks!
<?php get_header(); ?>
<div id="content">
<div id="contentleft">
<div class="postarea">
<h5><?php single_cat_title(); ?></h5>
<!--Replace cat=1 with the Category ID you want to display in this section.-->
<?php $recent = new WP_Query("cat=1&showposts=5"); while($recent->have_posts()) : $recent->the_post();?>
<h3><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h3>
<?php if( get_post_meta($post->ID, "thumbnail", true) ): ?>
<a href="<?php the_permalink() ?>" rel="bookmark"><img style="float:left;margin:0px 10px 0px 0px;" src="<?php echo get_post_meta($post->ID, "thumbnail", true); ?>" alt="<?php the_title(); ?>" /></a>
<?php else: ?>
<a href="<?php the_permalink() ?>" rel="bookmark"><img style="float:left;margin:0px 10px 0px 0px;"src="<?php bloginfo('template_url'); ?>/images/thumbnail.png" alt="<?php the_title(); ?>" /></a>
<?php endif; ?>
<?php the_content_limit(400, "[Read more about this property]"); ?><div style="clear:both;"></div>
<div style="border-bottom:1px dotted #BBBBBB; margin-bottom:10px; padding:0px 0px 0px 0px; clear:both;"></div>
<?php endwhile; ?>
<p><?php posts_nav_link(); ?></p>
</div>
</div>
<?php include(TEMPLATEPATH."/sidebar.php");?>
</div>