I like interesting options. For instance, elves have been done to death. To Death, sir! On the other hand, I liked the Ghost Elves from some old Dragon magazine article (IIRC) -- they were a subtype (which I don't like in general) but had an interesting backstory (exiled to the Ethereal Plane) that impacted their powers in a meaningful way that made them feel actually distinct from the other elf subraces.
And I generally don't care for subraces -- being "an Elf" should be enough of a description of your character's ancestry. "Oh, I'm a City Elf." "Oh, what's that?" "It's basically the same thing, but I do stealth in urban environments instead of woodlands! I also learn to drive a cart instead of riding a horse! And instead of longswords, we use shivs! Totally distinct!" Like, it waters down the flavor of "Elf." Also, I would never describe myself as an "Urban Human" -- I'm Urban and I'm a Human, but those are not related items, and it feels weird to link one to another that way.
I don't know if I'm explaining myself very well, and I'm definitely not being helpful. What about race-clases and race-not-as-classes for the historical weird creatures:
Acephali,
Cynocephaly,
Monopod, etc.? I don't think those have been done as serious entries.