Well, I'm very pleased with the way the borders turned out on this quilt. I think the pink inner border could have been a bit narrrower, but I'm certainly not going to make any changes at this point. This quilt will hang in my 2 story entryway when I have it completed. It's wild, isn't it?
Edited to add: I forgot to credit the pattern designer for this quilt! The pattern is Zuzu's Petals, designed by Carrie Nelson of Miss Rosie's Quilt Co.
Also - the instructions I wound up using for the mitering were from this site. I used the first technique.