Multiple flags for the same language

Do the custom flags cover your needs?
https://polylang.wordpress.com/documentation/frequently-asked-questions/the-language-switcher/

Thanks for your prompt reply.

I have already read the doc and made full use of the custom flags. I am sorry that I was not any clearer in my request. But I would like to know if it possible to customize even more the custom flags, as far as I understand the naming convention for the flag is restricted.

The issue is that I want two shapes of flags:
the active language flag needs to have a shape different from the inactive ones. In other words I am trying to get at the same time
active_en_US and en_US flags, active_fr_FR and fr_FR flags an so on This was my first bullet.
And then because I have several themes and designs in MU, I am trying to get as well active_cooking_en_US, cooking_en_US, active_tourism_en_US, tourism_en_US……

Any thoughts on how to customize flags name?

To do such thing, you will have to code your own language switcher. If you are a php programmer, it should not be too difficult. In that case, to help you starting, here is how to get the translations of the current page:

global $polylang;
foreach ($polylang->get_languages_list() as $lang) {
	// use $lang->name to get the language name
	// use $lang->slug to get the language code
	$url = $polylang->get_translation_url($lang);
	// $url === null if there is no translation available
}

Thanks for the tip, I will give it a try.
I am not a programmer by trade but I get the hang of what needs to be done.