Snowball quilts are great to use with charm packs and layer cakes. I pulled a few heart prints out of a layer cake and made a quilt for Valentine's Day.
Lay a 4 inch squares on layer cake piece corners, right sides together. Stitch from corner to corner and trim.
Here is an example of charm pack snowballs. Notice the corner pieces are different and makes a blocks to use with sashing. The corner cuts are 2 inch sized for charm packs. I'm going by a fading memory so you best test out the size of the square.