Filter function to modify genesis_seo_title and place an icon before the site title http://www.davidmottershead.com/articles/icon-site-title-genesis/

genesis-seo-title-filter

add_filter( 'genesis_seo_title','custom_genesis_seo_title',10,1);
function custom_genesis_seo_title ($title) {
$inside = sprintf( '<a href="%s" title="%s">%s</a>', trailingslashit( home_url() ), esc_attr( get_bloginfo( 'name' ) ), get_bloginfo( 'name' ) );
	if (is_front_page()||is_home())
	{
		$title = '<h1 class="site-title" itemprop="name"><span class="icon-home2"></span>'. $inside .'</h1>';
	}
	else 
	{
		$title = '<p class="site-title"><span class="icon-home2"></span>'. $inside .'</p>';
	}
return $title;
}