This might be of interest to y’all.
I was browsing for spare parts for my Fairphone 4 and I found a really interesting manufacturer that carries a bunch of accessories for the Fairphone 4, but also Fairphone 3 and - get a load of this - Fairphone 5 already 
I ordered those two cases for my Fairphone 4:
They also have this one for the Fairphone 4, but I don’t much care for it, so I didn’t order it. But if you like that kind of case…:
They have those cases in a bunch of colors too.
So… 3rd party accessories for Fairphones. Whoever said it was a niche manufacturer eh