If you wanted you could create cowboy aliens with heads for hands, or segmented centipede bodies, or whatever you wanted. For a cheap plastic toy they were pretty fun.
You can't see it in this photo but the faces are very realistic and almost scary. I remember being disturbed by the faces as a kid. What you could do to make the faces even more disturbing was to pull the neck stems out of the bodies Close Encounters style.
I looked on ebay and found similar toys. These were made either by Transogram or Timpo in the 1960s. I was surprised to see they were going for pretty cheap, about $1 each.