Thought, I'd share this.

http://www.robotviking.com/wp-content/uploads/2012/06/random-aliens.png

Those are pretty interesting although I'm afraid a fair number of them won't fit well with 40k, they can give some good ideas for making Xenos races. Thanks for sharing.

Sure they'll all fit…

…on a pyre

MKX said:

Suffer not the Alien to live.

Why would you ever burn a Xeno?? They're perfectly well able to work themselves to death in some Uranium mine or other. ^^

That way, they can try to mitigate their sin of being born Xeno…