In case you're not a fan of icky sickly space marines, I have reflavoured the Death Watch killteam into a group of Grey Knights. Poison reflavoured as Holy Fire, Extra damage as smites, you get the idea.

Since grey knights are still not a killteam I'm taking matters into my own hands and reskinning the warpcoven stuff to fit the theme of the grey knights.

This team combines the might of three elite Grey Knights, three options for Grey Knight Aspirants, with some well trained Adepta Sororitas Novitiates as stand ins for the Tzaangors (the stats fit surprisingly well)

A collection of tyranid NPO's that I have enhaned a little with extra rules here and there

A vicious cadre of Crisis suits take to the battlefield accompanied by their drones