My repro snowballs are 4" blocks with 2" corners. It's a copy of an antique quilt in the collection of Arlen and Pat Christ of Berks County, PA.
Also if you'll note, every other one is light or dark, like a checkerboard. And many of the blocks don't have 4 matching corners. I had lots of 2" scraps left over from another project, so they got used up in this.
It was a very satisfying project to hand piece.