Thanks Deafnala!
This is definitely my most ambitious, and my best, modding effort to date. I combined the top half of a giant "grim reaper"-type Horrorclix figure with two pieces of a giant D&D snake mini and sculpted the lower part of the cloak with greenstuff. I used some viper-type Horrorclix to make the arms and end of the tail. The victim is a Citadel flagellant.
I had to cut apart the viper and put three pieces together to make the left arm/snake the right shape, then fix the shape with greenstuff and re-texture. Some of the snakeskin re-texturing came out perfect, while in other places I'm not happy with it. I'm curious how others get a fine level of detail with greenstuff. I've heard people mention dental tools in relation to things like belt buckles - do people also use magnifying glasses? My old eyes have trouble with the fine detail...
You can't see it well in the pictures, but I'm particularly proud of the flagellant's left arm that's being pinned by the snake/arm. I cut one arm piece off at the shoulder and then shaped and glued a different cut off lower arm piece. It allows the snake to wrap smoothly around. If you look REALLY closely you can see that the arm doesn't go all the way through, but from more than 6" away, it improves the illusion of his arm being pinned by the constriction of the snake.