I started making these neck knives years ago, hafting small blades into deer leg phalanges. There are four of these bones in one deer leg, and have been used for a number of purposes - fishhooks, whistles, rattles. These have been popular at rendezvous because of their unique blend of bone and stone.
A couple of small 6 1/2 inch jasper bladed knives. It is interesting that in the past half dozen years there has been a lot of imported jasper arrowheads from India showing up at the rendezvous. They are a little blocky in the cross section, but knapped out of some nice material. So, I decided to rework some into blades and haft them into deer leg bone handles. This will look good in neck sheath.
I've been interested in primitive skills ever since I read Larry Dean Olsen's book, Outdoor Survival Skills, decades ago. The past 10 years, or so, I have been striving to learn the skills...flintkapping, hide working, friction fires, edible & medicinal plants, etc. Having gained some proficiency, I have been demonstrating and teaching at historical events and gatherings. It is a never ending journey.