beautiful quilt - I haven't attempted mitered corners yet. Yours are great!
I looked at a couple of videos. The one that worked best (with these stripes anyway) was to fold the corner of the quilt into a 45 degree angle (wrong sides out) and then use your longest ruler. Set it along the quilts 45 edge and then draw a line on the (back) of border. Doing it this way, I could put a (very thin) metal ruler along the border line and check to see that the stripes matched. It worked like a charm. I did do some ripping and refolding as I hurried and didn't have it just right. This method works great. Thanks for your encouragement. Yolanda Wood River