The Chaos Cultists look so cool and are something completely new that I started with those. I still maintain focused on my greenskins but it's nice to paint something else in between projects.
I painted up my first 10 cultists as traitor guard. If you look closely to the models you see they wear Imperial Guard like uniforms with a lot of rag tag cloths. The idea is pretty cool. I imagine these guys being left for dead on some desolated platen full of toxic hazards. After years of struggling to stay alive they have lost their faith in the emperor and have been corrupted to the dark side...CHAOS!