Native peoples and early pioneers have used nuts to dye cloth, yarns and more. The tradition of using nuts to dye things lives on. Some scrap book hobbyists use walnut dyes to die paper to give the impression of aging or antique looking paper. Calligraphy ink can be made from walnuts.
Kick A Dee makes yarns using natural dies including some that may contain nut oils Kick A Dee
Quiet Fire Design makes Walnut Ink for calligraphy uses. Gelatin Stamps makes walnut ink crystals for stamping.
Basket Makers gives an overview of how to make dies for baskets, from harvesting of the nuts to making the dyes for staining baskets and other things.