Show wordpress posts in arbitrary order. Best for category page. Problem solves, as always, on WordPress Answers http://wordpress.stackexchange.com/questions/89148/how-to-order-posts-in-an-arbitrary-order

wp-arbitrary-order

<?php
$custom_query = new WP_Query(array(
'post__in'  => array(4, 9, 12 /* whatever your post ID's are here */),
'orderby'   => 'post__in',
));

while ($custom_query->have_posts()) {
$custom_query->the_post();
get_template_part( 'content', get_post_format() );
}
foundation_pagination();
// restore the original query
wp_reset_query(); ?>