That’s doable, how many filter items do you want to change? If it’s a small number I can give custom css code. You’d better send me your site url and some sample images so I can guide you.
I need more information, send me some sample images, can provide a site which has the feature you wanted.
Beside customizing the native faceted search module, you would also search for other advanced filter modules, I guess some modules may have the feature you wanted built-in.