I noted in a recent post that my partner, whose ancestors were Lenape or 'friends' of the Lenape, and who was schooled in Native American lore by his father, has the belief that when the early Germans settled in Pennsylvania in the 1600-1700's, there was a great deal of crossover of artistic motifs between the two groups. It's generally held that many of the single men living out in semi-wilderness areas married Native American brides and that this would explain the blending of motifs.
These motifs have become identified with American folk art, as in Pennsylvania hex signs, quilt motifs, etcetera, with which we are all familiar. So, I'm including some of these Native American motifs as points of comparison with the so-called Pennsylvania Dutch and other American folk motifs. The one on the right here is a Menominee motif. By this time there has been plenty of newcomer (mostly European) presence in their land, so I can easily see where they may have adopted this motif, but the bold style seems very characteristic of Native American traditional art, to me. I'm not an art historian by any stretch, so this is just my opinion.
The top motif is an Acoma Pueblo water bird, and the quail is also Acoma. I include these because of their similarity to the European and Pennsylvania Dutch 'confronted' bird motfis. Yet the Acoma were most likely not that heavily influenced by the German immigrants. If anything, we might expect to see more Spanish influence, but I don't see that influence here.
If anything, I would say that the Native American artistic treatment seems to be characterized by a kind of 'boldness.' I remember reading somewhere in my travels some authority in art saying that the Pennsylvania Dutch or Native American art was surprisingly 'modern' in flavor, and that is certainly true of the motifs represented here. I'll include as a final note a First-Contact Potawatomi motif and one from the Sauk Fox. All illustrations are courtesy of the Dover clip-art series, North American Indian Motifs and Indian Designs.