You know, I never knew how fun these could be! They take a few hours, from start to finish including cutting and binding. For a craft fair, have no idea how much to sell them for. I'll make a few more like this and then some hot pads... those should be more fun because you can vary the blocks and the fabrics!
Edit: The sides aren't really crooked, I guess I just didn't lay it down flat on the floor properly...