Well, sorry to nitpick, but actually the Morlock's appearance in the original comic book canon was more complex, as I recall. While many of them were born with visible mutations, most of them were not. There was an early member named Masque, who was horribly disfgured with massive bodywide scarring and was of indeterminate gender. Masque had the power to change others' shapes permanently. Hair, skin, body structure, you name it, even gender. The irony was that Masque could not change his/her own deformity in the least.

When you joined the Morlocks, which was more like an underground band of refugees and homeless people than the political group shown in the movie, you were required to have Masque change you, always into a form which made it difficult to interact with the normal humans on the surface. This showed your degree of committment to the cause of mutant seperatism, and removed the inherent split between human looking and non-human looking mutants. Some of these changes were fairly minor, like green hair; some were more upfront, like facial tattoos; others were bodywide structural changes.

I think this is particularly interesting for the bodmod community. I can't tell you how many people have told me their mods are a sort of filter, keeping the closeminded people away, echoing the seperatism of the Morlocks. Conversely, how many I have heard expend a great deal of energy trying to prove that modded people are just like everyone else, ala the X-Men. I guess every movement has it's seperatist extremists and it's integrationist moderates. Malcom X and MLK, for example.

And, yes, before you ask, I am the geekiest man on the planet.