We'd love to have high-quality N95 respirators like the Dräger 1950 & 3M Aura in various colors, but since we don't, you can always use magnets to decorate.
Magnetic lapel pins:
https://amazon.com/dp/B0BXWVM4SV
And needle minders:
https://amazon.com/dp/B0BH2C4JWC
https://amazon.com/dp/B09YV3Q6L2
https://amazon.com/dp/B0BH2FKP4V
Both work!
I have a lapel magnet in my profile picture, and both are on Amazon & Etsy. They're also called needle/cross stitch/embroidery magnets.