I spy fabrics I would choose
You don't have to do what I do. I've been asked what kind of fabric design to choose. I like to choose a design that I can cut a 5" strip selvage to selvage and then cross cut into 5" pieces. I don't always enjoy fussy cutting, so I avoid anything that has to be fussy cut.
I took a sheet of copy paper and cut a 5" square hole.
Here are some that I've used in swaps before: