Unfortunately, the blue glow that Apple's designers have chosen to overcome this gap is somewhat garish and just plain lacking in style. In response, creativebits has posted a tip for changing that glow into something a little more eye-catching and a little less flashy.
The process is fairly simple and involves replacing two PNG image files within the Dock application. Creativebits has the full explanation as well as a sample set of replacement files that work pretty well and look very tasteful. Follow the break for a preview of the tip in action and decide for yourself whether the difference is worth the effort.