I will have an array of really nice nock overlay materials next week. Lots of different woods, with different color resins etc. I haven't seen anything like it on here.  Could also be used for strike plates etc.  I also do matched crested arrow sets.  If you let me know what you need as far as spline, length, colors, etc.  I can hook that up as well.  I'm making a really special bow for a really special person and I'm dead set on sturgeon skins so if there's anything else you are looking for let me know and I'll see what I can do.