To make it as a 10" quilt block, you'll need 2.1/2" squares: nine blue and four white, together with six 2.7/8" squares in both blue and white for the half square triangles. After you have made the half square triangles, the patches are simply laid out in five rows of five and sewn together across the rows. It is classified as a five patch, not as common as the four or nine patch blocks.
As soon as that is finished I shall return to my star border and try to get that finished this week. As it's Monday I'm linking up with Marelize over at Stitch by Stitch.
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Hope to see you again soon.