Here are a few photos of the blanket being put together. Once I finished all 9 of the squares, I did a SC around each of them in their own background color. Then I did a black trim around each of the squares in DC.
Then with black yarn I did a sort of mattress stitch attaching each of the squares together. I did this on the front and back of the blanket to make sure it was really secure. I finished the blanket off with a black trim of DC, and a double stranded SC in blue.