Think of examples that not only answer the question but also provide unique insights about you. For example, a good communication skills example would be one where you not only communicated but also had to demonstrate leadership, problem-solving, or innovation ie. communicating across cultural/language barriers or w/someone in your organization that you don't usually interact with.

You should also look at a couple of MBA prep books (a good one is "How to Get Into A Top MBA Program" by Montauk and "MBA Game Plan" by Bouknight) for assistance.