The Flamers, as you can see, were left stock. I felt they were intricate enough, and that they didn't really need any modification to suit my purposes.
The Plaguebearers were not left stock. As you may recall, I mentioned that I would convert them into what I now dub 'Plague-itors', mecha daemonic entities which serve my Dark Magos' will. I've only built six of them thus far, because I want each one to have its own uniqueness.
The conversions used Maxmini bionics, GW spares, as well as come custom make limbs, such as bionic legs. Each one has their own unique image, which is helped by the wide range of parts used, including an Arco Flaggelant's arm, chainswords, backpack vents and plasma cannon power units.