Have you ever heard of the Golden Mean? It has to do with the relationship of the measurement of the width and length of things. Think of a 3 X 5 card, or a 4 X 6 picture. Larger pictures 8 X 10, 12 X 14, etc. If you saw a quilt that was 30 X 80, you would say that looked quite odd. Wall hangings can be long and thin, or short and fat, but most quilts need to be the shape of beds, which are square or something close to a Golden Mean.
We had a thread on here a few days ago that discussed the Fibonacci Sequence. It also had a discussion of the Golden Mean. Hope you can get some help from this to make your quilt "pleasing to the eye".