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.
Best of All
Free Quilt Block Pattern
The Best of All quilt block is a nine patch which will give you some experience in using cut pieces to make a difference arrangement of the patches. I'm referring to the patches adjacent to the centre square which use a square, some half square triangles and some quarter square triangles. These pieces are joined in a frequently used patch (and I don't think there is a specific name for it), but it is not a common patch. There are also some flying geese units thrown in for good measure. All in all this is a fun sewing experience.
The two sample quilts illustrated are both set on point with sashing strips, but each has a personality of its own.