Yeah, I know, taking a picture of blue models on a blue background is a shitty idea, just bear with me for a second :V

So I thought I'd show a little contrast between the sects of my homebrew chapter, and the only units I have completed which can demonstrate this are my Sternguard squads.

So, on the left, you have the puritanical sect (counts-as Black Templars on the tabletop), who believe that the desperation of their chapter is no excuse for their reliance on mutants and apocryphal rituals. They make up the entirety of 2nd Company, under the ostensible leadership of the chapter's high chaplain, Xipe Totec (though he is still beholden to the orders of their current chapter master, Tezcatlipoca).

On the right, you have the pragmatic sect (counts-as White Scars), who, due to their chapter being nearly at Lamenters levels of under-strength, aren't too picky about their methods of war. Though not in the least bit trusting over their mutated brethren, they still allow themselves to be placed shoulder-to-shoulder with them during battle, and don't exclude them from their pre-battle rites.