Got a few more done; the unit is almost complete. I'm going to add a Nurgly symbol to the Icon Bearer and clean up a few areas on them with some highlighting and washes. I started using some purple wash on these and it shades the guts nicely.
I'm seriously contemplating doing a big ol' conversion of a Great Unclean One next. My luck is as soon as I do it, they'll announce new Greater Daemons are being released, not unlike the Plague Zombie kit which is coming soon. We shall see.