The subway tile just stops at the end of the sink wall. It's incredibly awkward!
I was a little worried that painting the walls would make the tile stop even more noticeable. Now, well, it's still awkward but I'm so happy with the color that it bothers me much less. The paint color is Benjamin Moore's Sea Pine. I spent a few hours scraping the old paint off the black boarder tiles and I love how crisp the lines look now!