When I do things like this I weigh the balance of whether it will always bother me or whether it looks like it's supposed to be that way. I had a film strip border that would have ended up with a big white space at a corner, so I turned the last square into a pieced star. You can applique a red square onto your white sashing or you can pick out the quilting. If you decide to remove the piece, look at the bright side - the part that needs to be removed and turned around is right at the edge and you can do the unsewing while watching tv.