Most were not brightly coloured since the pigments generally came from minerals (earth colours) and plants, which are generally dull. Many modern replicas and illustrations show the colours far too bright, since they use modern paints rather than authentic native pigments.
See links below for images of genuine Plains shields, with typically dull colours:
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nomadic or sedentary is plains indians
in the great plains
It was not introduced, for the Plains Indians stole the horses from the spanish.
Buffalo meat was the Great Plains Indians food.
why were horses important to the western plains indians