This isn't even a swap I'm in but being the butt-insky I apparently am, here are some more ideas:
Some sort of baby carrier

Corn or another food domesticated by native americans
buffalo
drums
horses
playmat
petroglyphs (ok, that's *really* old but should still count?)
dream catcher
cornhusk doll
blankets (saddle or bedding or otherwise)
kachina doll (if you are comfy with doing that)
canoe
beads or a "kit" for making (and remaking!) a necklace or bracelet
sand art
shields
bowls for preparing food
baskets, baskets, baskets
medicine bag/pouch
quiver/arrows
vegetation
food: berries to pick, fish to catch
feathers or bear claws
arrowheads
(bored yet?)
I'll, uh, be lurking to see what you all end up making

lol!
Tamara