Nurglings are pretty easy to paint up, so adding six bases to the army and calling them two regiments is maybe a bit of a cheat. But I do actually intend to use both regiments. They scout, so can take up advanced positions in deployment and hopefully threaten artillery, small units of shooters, enemy scouts and the like. Daemon armies seem very fragile to my eye (though I have never actually fought with or against them as yet), so I am a bit obsessed about countering artillery and shooting.
Keen eyed observers will have noticed that these little bands of mischief makers contain a few surprises, in that some of the models are not nurglings. A quick scrabble through my bitz box and I found a few old familiars that helped to add a little variety to the mix.