Sometimes to keep the ceremony aisle simple is by doing nothing...but then again it can still be simple by adding a few chair decorations or florals, however, the key is to personalize it. The small cluster of flowers on the chair will pop with a wide sheer ribbon tied on. The aisle runner doesn't have to be just WHITE but instead BLUE. Maybe the runner is "bedazzled" by the bridemaids. Or the pomanders on the shepards hooks have crystal garland swagged between them.
The point is to personalize the ceremony aisle in your style - simple to bedazzled.