Laying flooring on the diagonal can visually expand a small or narrow room, such as a galley kitchen. It's also a good solution for older homes that aren't square, where a parallel-to-the-wall installation might make that flaw more noticeable. And it doesn't take any more flooring than a typical install.
-inch St. Andrews red oak in Natural, about $5.99 per sq. ft.; mullicanflooring.com