Using this snippet you will be able to append a login form anywhere in your theme using shortcodes Continue reading →

function wpc_login_form_shortcode() {
	if ( is_user_logged_in() )
		return '';

	return wp_login_form( array( 'echo' => false ) );
}

function wpc_add_shortcodes() {
	add_shortcode( 'wpc-login-form', 'wpc_login_form_shortcode' );
}

add_action( 'init', 'epc_add_shortcodes' );

Source: Wprecipes.com