Adding a search form input button icon inside the input box in Genesis. http://sridharkatakam.com/adding-search-form-input-button-icon-inside-input-box-genesis/

functions.php

//* Make Font Awesome available
add_action( 'wp_enqueue_scripts', 'enqueue_font_awesome' );
function enqueue_font_awesome() {

	wp_enqueue_style( 'font-awesome', '//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css' );

}

//* Customize search form input button text
add_filter( 'genesis_search_button_text', 'sk_search_button_text' );
function sk_search_button_text( $text ) {

	return esc_attr( '' );

}

style.css

.search-form {
	position: relative;
}

.search-form input[type="submit"] {
	font-family: FontAwesome;
	clip: inherit;
	width: 16px;
	height: 16px;
	background: transparent;
	color: #999;
	right: 10px;
	top: 18px;
}

.search-form input[type="submit"]:hover {
	color: #F15123;
}

.site-header .search-form {
	width: 189px;
}