So here's something interesting I just thought of
about the Geth...
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I always thought it was weird that the Geth looked so similar to the Quarians in their suits, since the Quarians wouldn't have needed to wear the suits when they built them. But then I thought about real life robots, and what's the most advanced human-like robot? Honda's ASIMO (http://en.wikipedia.org/wiki/ASIMO). And what does it look like? A human in a space suit. Well played, BioWare.
There's also the tubes coming out of the back of the head, and the way the lights on the Quarians' helmets' breathers are flanked by those to fang-like protrusions, just like the lights on the Geth's heads.