Originally Posted by Vicki W

As a softer border are you thinking of a solid border or a different pattern. I tend to agree, I think the piano keys might distract just a little from your lovely blocks. But I am scratching my head as to what to substitute instead.

Maybe a thin "strip" border with some of your colors (going horizonal instead of vertical.) and then repeating your thin black border.

It is going to be beautiful whatever you do with it.