The 'alien' alien

There must be some interesting way of depicting an alien without it being just a distorted version of some known organism. The common depiction of the alien is an elongated human being, standing on it's rear legs, 2 eyes, a mouth and a large brain. It doesn't really seem alien to me. Just as God's are not Godly enough "We deny God as God.". Turns out we also deny that the alien is alien.