WIP: finishing touches

I bought fabric for a quilt for one of my nephews years ago... and finished that quilt yesterday. That nephew has aged since I bought the fabric and I wonder if he has outgrown the little dog theme and pattern on the print I used in his first quilt.

I chose to make a second quilt, with an architecture/travel theme in more “grown-up” prints and a subtle colour scheme. I am not, though, satisfied with not adding a border (as the quilt pattern I used suggested). The lower half of the quilt is pictured below.

I think I will add a border. I wonder if I should add a strip of solid steel grey fabric. If you have any ideas that would help me, please leave me a comment. Thank you!