What we have here is a 7 man squad of Plague Marines combined with lots of bits from a Tyranid Gaunt box and some claws from the ancient Spacehulk era Genestealers.
Painting wise as this is a Heresy-era force, this squad was to be the “worst of the worst”, meaning these were the fellows who threw themselves wholly at the feet of Father Nurgle. They needed to be the slimiest, most debased, and mutated marines in the army.
I gave them twice the dirty,grimy wash that the regular troopers got, and freely went in with some reddish areas and gloss varnish to give them bloody, emflamed bodies. They are the only unit that uses the standard baroque Chaos backpack as opposed to the Imperial ones I used elsewhere. The thinking was that these were the folks who would be afflicted in both body, soul, and equipment long before their other brethren who had not yet had time to slowly twist into the Plaguemarines we are used to seeing in the 40th millenia.
Gamewise, I run this squad as an alternative to using the Plague Terminators in larger games. I run them with Daemonic Talons (rending) in a rhino. At 3 attacks each on the charge, and T:5, they are a nasty piece of work for MEQs. The Aspiring Champion will use Daemonic Visage and is sometimes accompanied by 3 Chaos Hounds to make the squad 10 models for scoring purposes. The Iconbearer has the symbol of Nurgle atop his backpack.