I am always awed by a visit to Durham Cathedral which is a World Heritage Site and is filled with majesty and beauty. I was there last month when I stayed in Durham for three days.
Check out the scale and proportions of the building; the height, length, the size of the arches, the way the circular inlay on the floor mimics the large circular stained glass windows above the altar. This is brilliance in design and we should pay attention. Scale and proportions are both so important in designing quilts and adding borders.The mosaic tile floors and ornamentation around the pulpit of geometric shapes includes our beloved Flying Geese, stars, diamonds and more.
Repeated elements, e.g. triangles, made in a variety of sizes will make your quilt much more interesting than simply using triangles that are all the same size. Adding appropriately sized borders will greatly enhance your quilt top. I recommend auditioning different widths, (as well as a variety of fabric options and considering pieced borders), to help you in the decision making process.