I tried doing a search in MP and found this
https://marketplace.secondlife.com/p/Eye-Candi-Makeup-Eyeshadow-ALL-SHADES-DEMOS/4968022
it's a demo and has a natural eyeshadow. Maybe that might work?
or this one I came across as well
https://marketplace.secondlife.com/p/Elysium-Eyeshadow-Geometrica-line-nude/4419671
Hope that helps.