The white aisle runner rolled out just before the ceremony begins is an elegant statement, and when rolled by attendants as the music plays, lends an element of drama to the commencement of your ceremony. There are other options that make a personal statement as well; some of my favorite ideas embellish the rolled-out aisle runner, and others are a complete departure. Which one is right for you is a personal choice. It all depends on the overall look and feel of your ceremony and the level of formality that fits.
For Colin's elaborate aisle advice, keep reading.