Hi! Thanks to all who have helped so far! The squares are now sewn together!! I am now planning for and working on a border.
I am going to follow the advice for a solid border on the "inside" then a piano-key border. The blocks are about 8 inches square (or were before sewing together). Right now (without stretching/pressing the thing down) the dimensions are about 31 X 39 inches.
What width would look good for the inside border? I think I will look for a blue fabric (prob not totally solid--what do you think?)The piano keys are going to be probably 4.5"--this width gave me the most pieces to work with. If they are of variable size, what range would you use for blocks of 8 inches? I'm wondering if there is a rule of thumb for what will be visually pleasing. It's hard to see with the cut pieces just laying next to each other.
Thanks so much for looking! Have a great day.