It's quick and easy, and it's pretty, so I think it could work for the group.
I came across bowls and baskets on Pinterest made in a similar way. The crochet cotton I used for the mat is too soft for that, but perhaps a thicker thread could work?
Mmm, possible, but it would take a lot of practice to get it neat enough. Thumbs down.
I'm working now on a floor mat. I do like it, and it's easy enough, it might work for a project done over several meetings.