I don't do anything the same everytime. I generally have a plan for my project's borders but don't cut the fabric until it's time to put each on. That way, I can lay it out next to the completed quilt and see if my original thought really looks best. I must admit that I most frequently put on whole edge borders, often with a contrasting corner square. Sometimes, I have each edge a different color, especially for kids or landscapes. I have made pieced borders, but usually prefer my inner-quilt to be what stands out most.