I've made several projects and had a lot of fun with strings, but strings add up faster than what one person can use in a lifetime. It has to be at least 1 inch wide and 8 inches long. I am quicker to save lights than darks. I always seem to need more lights.
Right now, I seem to be on a log cabin kick, so 1 1/2 inches wide for them. The sewing is almost mindless (cutting seems to take longer) and the blocks are quick to finish. There are multiple layouts and no two tops look the same.