The Celts
Descendants of the Celts (at least, fashion-wise)
The Celts would paint themselves blue and run into battle naked. These scare-tactics worked for a short while on the Romans, but by Julius Caesar's time, the Romans had won over the Celts.
The Celts were also "primitive" in some other respects--for example, they drank the blood of their enemies. But they also were very artistic and left behind many artifacts (though they left no writing).
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Images courtesy of http://www.blogwaybaby.com/Blue%20Man%20Group.jpg