If the stone age isn't your fancy, how about a world where dinosaurs reign? Apparently possible, you could play a sentient dinosaur. Loosely based on the Quintaglio Ascension series of three novels by Robert J. Sawyer.
dinosaur species include:
* Tyrannos -- descended from nanotyrannosaurus, this group of sentient dinosaurs sport a tail, and the males and females are sexually dimorphic by color. Males have red scales all over their bodies, and the females are green. They lay eggs and eat meat. They have a humanoid body. Tyrannos are the humans of the setting.
* Allosaurs -- descended from, yep, allosaurs; the person is tailless, and the males and females are sexually dimorphic. Males are red scaled, and the females are green scaled. Both have a humanoid body. Allosaurs are the orcs of the setting. Half-allos don't happen.
* Velociraptors -- beige skinned, except for dark dots of purple, Velociraptors are humanoid in design and have their "belly button" on the lower back. They also lack tails. Females have breasts like humans do, and their heads are covered with feathers. They lay an egg that is made of chalk. Descended from Velociraptor mongoliensis, Velociraptors are the elves of the setting. There are no half-velociraptors.
* Deinoychii -- Actual Deinonychus antirrhopus, they are smart, intelligent, and pack hunters. They are also featherless (I actually talked to one's subconscious and asked if they had feathers. They don't, heh). Worse than orcs.