I cut 5 dark 2X5 inch rectangles and 5 light 2X5 inch rectangles. I lay the light wrong side down on the dark in a upside down L shape like you join binding, draw the 45* line, stitch on the line, check to make sure it is a perfect join and then trim away the corner triangle to the 1/4 inch seam.
I thought the stripes would bother me but B is growing on me.