Here are two minis I pieced this AM. Both are 12-1/2" square. The one on the left has 2" finished blocks, the one on the right has 3" finished blocks. I like them both. Choosing a size depends on what looks you want.
A close-up of the one on the left, which will be added to my stack of mini quilts after quilting for my someday mini-quilt wall.
Both are pieced from men's shirts and muslin. I think the one with 3" blocks would look good with the outer muslin edge trimmed down a bit with a plaid border. But I'm leaving that up to the new owner.