A login page template for WordPress.

login.php

<?php
/*
Template Name: Login/Logout Page
*/

//* Remove our default page content
remove_action( 'genesis_entry_content', 'genesis_do_post_content' );

//* Add custom login form to our page content
add_action( 'genesis_entry_content', 'ck_do_login_form' );
function ck_do_login_form() {

	$loggedin = is_user_logged_in();
	$user = wp_get_current_user();

	if ( $loggedin ) { ?>

		<h3>You are already logged in!</h3>
		<p>Hello, <?php echo $user->user_firstname; ?>! Looks like you are already signed in. Thanks for being a part of this website!</p>
		<p><a href="/">Go to Homepage</a> or <a href="<?php echo wp_logout_url( get_permalink() ); ?>">Log Out</a></p>

	<?php
	} else {

		$args = array(
			'form_id'			=> 'loginform',
			'redirect'			=> get_bloginfo( 'url' ),
			'id_username'		=> 'user_login',
			'id_password'		=> 'user_pass',
			'id_remember'		=> 'rememberme',
			'id_submit'			=> 'wp-submit',
			'label_username'	=> __( 'Username' ),
			'label_password'	=> __( 'Password' ),
			'label_remember'	=> __( 'Remember Me' ),
			'label_log_in'		=> __( 'Log In' ),
		);

		wp_login_form( $args );

	}

}

genesis();

Tutorials: How to Build a Custom Login Page in Genesis