Easy Digital Downloads - replace the standard EDD menu icon with an icon from Dashicons

gistfile1.php

<?php

// remove the CSS for EDD's custom menu icon
remove_action( 'admin_head', 'edd_admin_downloads_icon' );

// filter EDD's post type args to use an icon from dashicons (http://melchoyce.github.io/dashicons/)
function sumobi_edd_modify_menu_icon( $download_args ) {
	$download_args['menu_icon'] = 'dashicons-cart';
	return $download_args;
}
add_filter( 'edd_download_post_type_args', 'sumobi_edd_modify_menu_icon' );