If you have a good pattern and a sewing machine, you can crank them out with any attractive outside pattern. HEPA cloth in the middle provides maximum protection, but the overall mask is washable. The more folks sewing these the better. Donate them to your local hospital, or sell them on E-bay, or anything in between. The more the better.
The first version uses a sewing machine, the second is hand-stitched. Both are genius.
Reusable mask DIY! Free pattern - Interchangeable filter
https://www.youtube.com/watch?v=OlrSNFC4DLs
DIY Free Reusuable mask - Sewing machine less, 30 minutes project!
https://www.youtube.com/watch?v=OdR4q9DOSws
I bet I can use my Cricut Maker to make them even faster!