If you don't want to cut the 10 blocks down to the pieced one's size, set them aside and measure the pieced ones, and cut new 10 ones to correct size. You can put sashing around them too or you can do just what you asked and use it the way it turns out. Save it, and you'll be able to see how you are growing in your work. It's fun to see. Don't despair. Keep on.