Read through the Snowball quilt block construction instructions before beginning if you aren't familiar with this method.
The top row of the illustration shows how one corner is added to a square.
- Gather the stack of fabrics cut for corner square-in-a-square units. Draw a line from one corner to the opposite corner on each of the smaller squares.
- Top illustration. Align a marked square in the upper right corner of a larger square, placing right sides together. Sew a seam directly on the marked line. Trim away the excess fabric 1/4" from the seam.
- Flip the corner fabric right side up and carefully press into place. Take care not to stretch the fabrics.
- Use the same technique to sew a square to the the opposite corner.
- Sew remaining two corners. Press the unit. It should measure 2-1/2" x 2-1/2".
- Make a total of four identical units.
- Repeat to make four square-in-a-square units for row midpoints.
- Repeat again to create the square-in-a-square unit needed for the block's center.