When I began writing the list I planned to play for the all Nurgle Chaos Daemon army, I found myself frustrated by the lack of a good elite choice that could move and do some damage. Lets face it, Beasts of Nurgle are anything but elite. So I looked over the list and searched for a way I could justify one of the other Elite choices and avoid my typical selection of the Blight Drones (as my playgroup has grown to hate these things). I decided 3 groups of 3 Flamers of Tzeentch would be a fun add to the army and add some surprise elements to an otherwise slow list.
So I had to ask myself how I could bend the fluff to fit my army and justify the 3 units from another Chaos gods section. I looked to some of the other fluff in the 40k and even Fantasy universe to help out in this regard. There are plenty of units with breath attacks of one sort or another and it seemed obvious what a Nurgle unit with similar characteristics to the Flamer would possess. First, they would have to be vomiting units to simulate the chaos breath attack of the Flamers. Second, they would need some small wings to show why they are jump troops despite being a Nurgle unit, which are typically very slow.
This is what I came up with.
Since I'm using the converted Pink Horrors to be my Plaguebearers, it left me with 10 Plaguebearers I didn't have a use for until now.