Just jotting down a few internet accessible ideas for Titanium pieces - things I have done, experiments, and things I could do if I had a more precise, reliable method of colouring.
Initial experiments from 2017
Ideas for project using anodised Titanium:
Possible colour range and voltages showing possibility of precise colouration
(from The Workbench Guide to Jewelry Techniques, Anastasia Young):
Finished Titanium pieces 2018 using etching and torch colouring technique: