Why does it need to be least conspicuous ? Are you embarrassed to be noise sensitive ? That is anxiety that is counter to your recovery. I've been using the yellow foam ear plugs for 15 years. Hardly anybody ever notices them if I insert them deep as recommended. Nobody has ever said anything about them.

Mack's makes skin tone ear plugs that have a great sound reduction rating.
http://www.amazon.com/Macks-Ear-Care.../dp/B0051U7W32