My grandmother was a quilter. It skipped generations. Most of her quilts were applique and primarily used solid fabrics. This snowball quilt is an exception because it is one of the few scrappy quilts she made (that we know of).
This version of snowball doesn't match any versions I've been able to find. The outer circles are divided vertically and horizontally, but the inner circle has seams running along the diagonal.
Given the range of colors and styles of the prints, I assume that most of these fabrics came from flour or sugar sacks.