There's not much that isn't improved by adding some Star Wars to a game, and this does of course also apply to a stellar game like Xcom 2. It is Steam user Platoon who has created a mod called "Star Wars Helmets", that is exactly just that - helmets from Star Wars.
With it, you can make your characters look like classic Stormtroopers (and the newer version from The Force Awakens), Republic Commando Clone Troopers, Scout Troopers and even famous characters like Boba Fett. Makes an already brilliant game even better, right?
"Star Wars Helmets" can be found on Nexus Mods as well, and there's also a mod for Halo helmets.
<bild>Halo helmet in Xcom 2</bild>
Thanks, Game Informer.