functions.php

<?php

function be_custom_loop() {
  $loop = new WP_Query( $args );
  if( $loop->have_posts() ): while( $loop->have_posts() ): $loop->the_post();
    $classes = 0 == $loop->current_post || 0 == $loop->current_post % 2 ? 'one-half first' : 'one-half';
    echo '<div class="' . $classes . '">' . get_the_title() . '</div>';
  endwhile; endif; wp_reset_postdata();
}