The man is inspired by this music video http://www.youtube.com/watch?v=MvSMGTRemwY&t=0m37s
The white girl inspired by this video http://www.youtube.com/watch?v=z6yQW5Zyp3s (Yes, I've linked to it before)
The black girl is from a horror book I read when I was a teenager. Sadly I no longer remember what it was called, but the description of her have hunted me for years.
I had a bizarre nightmare involving these guys a few nights ago. The man is more funny than scary now, but in my dream he was horrifying. ^^;