Currently the OutputFormatter of the Console command nicely colors the output when used on cli.

Some of the command I've created are executed via a backend setup module, the output is returned to the controller using a StreamOutput

    $application = new Application($this->get('kernel'));
    $application->setAutoExit(false);

    $fp = tmpfile();
    $output = new StreamOutput($fp, StreamOutput::VERBOSITY_NORMAL, <new HtmlFormatter()>);

    $application->run(new ArrayInput($options), $output);

Feature: a new OutputFormatterStyle to format the output according with html colors / bold / etc

This could be part of the DX-initiative (?)