Sixus1 has a grey alien. There has also been one here in free stuff, not sure if it's still there, but a seach for Alien or grey (eventually gray) should bring it up.

FREEBIES! | My Gallery | My Store | My FB | Tumblr |
You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.