Vehicle Camo Pattern inspiration: Pre-Heresy Space Marine Contemptor Dreadnought of the World Eaters Chapter.
Mortarion, Primarch of the Death Guard Legion before the Horus Heresy wielding his massive scythe Silence and his sidearm known as The Lantern
Perturabo the Lord of Iron, during the Horus Heresy
Warhammer The Horus Heresy - "Sanguinius confronts his former brother Primarch, the corrupted Warmaster Horus." Now this is why they think Sanguinius is gay.