Applying Backstretch to multiple Featured images in Genesis. http://sridharkatakam.com/applying-backstretch-multiple-featured-images-genesis/

backstretch-set.js

jQuery(function( $ ){

	$( ".content .featured-image" ).each(function() {
		var featured_image = $(this).data( "featuredimage" );
		$(this).backstretch(featured_image,{duration:3000,fade:750});
	});

});

functions.php

add_action( 'genesis_before_entry', 'sk_set_bkgrd_image' );
/**
 * If the Post has a featured image, display link to single Post above each Post while setting a custom data attribute to the Featured image's URL.
 *
 * Context: Posts page, all archives and search results pages.
 *
 * @author Sridhar Katakam
 * @link   http://sridharkatakam.com/applying-backstretch-multiple-featured-images-genesis/
 */
function sk_set_bkgrd_image() {
	
	if ( ! ( is_home() || is_archive() || is_search() ) ) {
		return;
	}

	if ( has_post_thumbnail() ) {
		$featured_image_url = wp_get_attachment_url( get_post_thumbnail_id() );

		echo '<a class="featured-image" data-featuredimage="'. $featured_image_url .'" href="'. get_permalink() .'" rel="bookmark"></a>';
	}

}

add_action( 'wp_enqueue_scripts', 'sk_enqueue_backstretch' );
/**
 * Load Backstretch and its initialization script.
 *
 * Context: Posts page, all archives and search results pages.
 *
 * @author Sridhar Katakam
 * @link   http://sridharkatakam.com/set-featured-image-headers-background-using-backstretch-genesis/
 */
function sk_enqueue_backstretch() {

	if ( ! ( is_home() || is_archive() || is_search() ) ) {
		return;
	}

	wp_enqueue_script( 'backstretch', get_stylesheet_directory_uri() . '/js/jquery.backstretch.min.js', array( 'jquery' ), '', true );
	wp_enqueue_script( 'backstretch-set', get_stylesheet_directory_uri() . '/js/backstretch-set.js', array( 'backstretch' ), '1.0.0', true );

}

style.css

.content .featured-image {
	display: block;
	min-height: 300px;
}

@media only screen and (max-width: 768px) {

	.content .featured-image {
		margin-bottom: 30px;
	}

}

@media only screen and (max-width: 320px) {

	.content .featured-image {
		min-height: 200px;
	}
}