Vashta Nerada were swarming, carnivorous beings. The name meant "the shadows that melt the flesh". The Tenth Doctor, Donna Noble, and River Song encountered them in The Library, a planet-sized library.
This was my costume for Halloween 2011. Motorcycle helmet, skull mask, craft foam cowl, painting coveralls, blue glowsticks.
I featured your lovely deviation in my Extra feature journal: Doctor Who
Thanks!