I completely finished "Fancy Squares"!
I wrote about it back a few days ago! The center of these blocks were some scrub pieces that I had purchased (they were new - not recycled fabrics). I ended up with quite a few pieces that were similar sizes - and I could only get 5" squares out of them - max width.
This pattern would also work for your "charm pack" 5" squares. I did use 2" and 2 1/2" strips going around those 5"x5" squares, so this could be a great "scrap buster". I didn't use my scraps, however. I went to my stash and pulled out coordinating fabrics.
I did finish up the pattern. It's here. Enjoy! It's really quite simple, but if you want your piano key border to fit as I wrote it, piece carefully!
Have a great day, wherever this finds you reading!