The Snowball quilt block, a plain square with half square triangles at its corners, is one of the most versatile quilt blocks you'll encounter. The Snowball can be used as a stand-alone quilt block, but it's always a good block to consider when you're looking for a connector to sew between other designs.
You can tailor the tips of the Snowball to suit the quilt blocks it's sewn next to, and you'll find that altering tip lengths is super simple. Learn how to manipulate the Snowball and I'll bet it becomes one of your favorite quilt blocks.