On Area 51 I finally hit a captcha and was instantly depressed. It's the same as the Stack Overflow captcha :(
Can we please get something more specific and awesome for Area 51, hopefully falling in line with the rest of the theme.
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If it's alien (well sort of) robots you want:
(assuming that this was the image I linked to in the first place)
There's always good old Cthulhu:
Not sure about ownership issues, though.
To make a kinder, gentler lord of the abyss and underworld, someone can just write (freehand):
I CAN HAZ CAPTCHA?
... on the image.
Alright, I think we should go with a Gaius Baltar administering the Cylon Detector Test theme.
Here he is administering the test, with benefits:
But that.... might not be fully work safe. So.... here's a pic of him looking at his own brain scan; it's "test-ish" so maybe that'll work.
We could go with just a Cylon:
Or Old Skool:
There have been any number of human-checking techniques in science fiction. It's an important plot element when the aliens or robots look like humans. Recent (relative to copyright) examples include V and Terminator. I can't think of an example right now that might have an image that's in the public domain.
I came across this movie-poster from Houdini's silent movie from 1918 called The Master Mystery which illustrates the human/robot relation quite well. Though I'm not 100% sure, I believe the robot could be an actual person in a suit..
So considering that possibility we should introduce a captcha to let robots proof that they aren't actually just disguised humans ;)
It should be an alien robot.