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<?php
// Do NOT include the opening php tag

<!-- 
Let's start with one about branding: if you ever wanted to change the WordPress logo on the login page with yours (or a client's), that's the code you'll need. It's easy: just open your functions.php file and paste the following: 
-->

function my_custom_login_logo() {
    echo '<style type="text/css">
        h1 a { background-image:url('.get_bloginfo('template_directory').'/images/custom-login-logo.gif) !important; }
    </style>';
}

add_action('login_head', 'my_custom_login_logo');

<!-- 
Reinforcing your brand communication with this little tweak is just the first step, you'll see how many things you can do without installing plugins. [via] 
-->