Ah, I would like a lot having my Custom Faction items...
I mean:
1. Custom Flag (I would like to have an editor to make a custom flag/logo, but even a Vault 111 logo on a blue flag will be nice...) to plant in every acquired settlment.
2. Painteable Armours & Power Armours. For example, painting the armours in blue...
3. Painteable Military Uniforms. Or even Military Uniforms not only green, but even in different colors, as blue for ex.
So with 2 and 3 you could have your Army with your cusomized colors...