I've left this mission till almost last, because traditionally I'm not much of a maker. A doer, yes, but my carpentry, pottery, woodsmithing, and metalworking skills are all sub-par. The best thing I can do is build a computer from component parts, or grow plants.
Building a computer didn't seem like an appropriate way of representing indigenous technology, but maybe growing a plant would. Obviously a plant itself isn't durable, but a pot sure is!
So I took one of our nicer empty pots and painted some knowledge that I've learned recently: the three sisters guild actually had one more sister - Amaranth
! So I painted the names and drew the seeds next to them on the pot, and planted amaranth in it. I also spread three heirloom varieties of amaranth around our three sisters guild plot, and figured that was the best thing I could do for future generations...