The Skull Island Natives presented in the 2005 version of King Kong are
frighteningly powerful. They are a people on the edge of extinction on
an island of dwindling resources. The culture that build the gate is
gone leaving just fragments of a native population full of superstition that
worship the great Kong.
"To create the frightening,
primitive tribe on the Island, 100 actors were transformed into Skull
Islanders by donning Weta-designed costumes (constructed from sea shells,
feathers, fish and animal bones and human hair), wigs (a portion of which
were hand-knotted), makeup, body paint, prosthetic teeth and weapons. While
of the same tribe, different looks were created by varying the weapons, wigs
and contact lenses. For a handful of actors given featured parts (the feral
child, the shaman and the drummers), their longer time on camera meant more
work to produce their looks—the actress playing the shaman spent five hours
in the chair with three prosthetic and makeup technicians working to
transform her into the terrifying crone. Additionally, as the Islanders are
first seen during a rainstorm, Weta workers developed a waterproof process
for coloring their skin."
from King Kong Production Notes