I can tell one how to easily* do a "good" kilrathi voice. It's a simple process, but actually turns out pretty well. Ask anyone who's heard my Kilrathi voice samples. I mean, it's not exactly perfect, but it actually sounds Kilrathi. My only problem is that I can only really get one Kilrathi voice from my throat.
All you do is:
1) Using a snarly voice, record your line as quickly and articulately as possible (emphasis on articulation. Otherwise, the process just slurs the hell out of it).
2) Record another track of just snarling/rumbling in the same voice. Try to make the 'tone' of your snarling match the tone of you line.
3) Using a program (I use Yamp, which is free), slow both clips down, according to taste, so that your voice/snarling is deep like a Kilrathi, but still understandable. (They don't have to both be the same speed, btw)
4) Overlay the voices on each other. Mixed properly, it will sound something akin to WC3 Kilrathi vocals from the movies, where there is a snarl underneath the voice acting.
Try it, it works.
