I so understand this delima! I have one of bunnies that is staring at me as I am typing. Like you I tend to OCD about it. Maybe you want to trim them down and add a boarder to it. Trim it up to the size of the star block you decide to do. The halloween blocks will then fit nicely as a square to the next square star. At this time of the year you should be able to match the colors in you panels to an added boarder. Best of luck.