When trying to design an alien species (generally around the principle of convergent evolution on an earth-like planet), the same image keeps popping up in my head and pushing my ideas aside... Dam you Giger! (Edit: I should mention that this isn't Giger, but the original design is.) I just find this to be the elephant in the room in any film or literature involving aliens or unusual creatures. There are few things that seem to be unsurpassable in terms of their concept and design, but this is one of them. Also why is spell checker on this site picking up unsurpassable?