I don’t want to host this, but what about a Customize my face mask Swap.
We make a face mask (or several) with special fabrics, maybe even print or dye the fabrics ourselves. Think fashun darling. Or if people really want to have fun with it, do something a bit more on the artsy side like @RagingSloth’s Most Ridiculous Mask Ever. We can work with our partner to let them know what patterns/sizes we prefer, have a couple of themes to run with, and then let the creativity take over.