As a general rule, an intermediate block is rarely more difficult to make -- it just contains more pieces and therefore more seams. This is the reason that it is important that you can sew an accurate quarter inch seam allowance. Once you have mastered a precise seam allowance, you will have no difficulty in sewing the majority of quilt blocks.
Free Quilt Block PatternMexican Star is one of the many favourite 10" quilt block patterns that can be constructed in a couple of ways. I have chosen to use half square triangles and quarter square triangles to use familiar quilt patches and also as a teaching experience. I have also included instructions for a larger block as well.
You can make many variations in your personal quilt by adding sashing, as shown in the illustrations, or perhaps see what secondary patterns you can create by placing blocks side by side. Imagination is the only requirement.