How nice!
The water and sky fabrics sure make the block.
(I don't want to spoil the fun of the block, though, I don't want you to do a bunch and then be surprised and disappointed. You would need to extend your pattern on the top, to give you the 1/4" seam allowance. Otherwise when you join them together, your points on your sails are going to get lopped off.)
Have FUN!! with this one