I might do the following. Lay the two border ends out straight, one horizontal and the other vertical. Face or right side up. Fold the top border end under itself in a 45degree diagonal fold matching the pattern or stripes. Press and pin. Blind stitch the fold and trim the excess fabric from the two border ends.
I should have read all the posts and I would have seen that the problem had been solved.
However, I have used this method in making attic window blocks.
Last edited by Holice; 10-27-2013 at 01:28 PM.