require "twitter.lib.php";

$username = "trembl";
$password = "••••••••";

$twitter = new Twitter($username, $password);

$options = array(
	"profile_background_color" => "fff",
	"profile_text_color" => "fff",
	"profile_link_color" => "fff",
	"profile_sidebar_fill_color" => "fff",
	"profile_sidebar_border_color" => "fff"
);

$update_response = $twitter->updateProfileColors($options);
print_r($update_response);

Nice, isn’t it?