WAVE is a free web accessibility evaluation tool provided by WebAIM. It is used to aid humans in the web accessibility evaluation process. Rather than providing a complex technical report, WAVE shows the original web page with embedded icons and indicators that reveal the accessibility information within your page.Even though it's marked as Beta, i found it very stable and usable. Try it for yourself and see the results.
One good example of a good website that combines accessibility and creativity is CSSZenGarden. The system found no accessibility errors on that site while it continues to amaze lots of people by it's beauty of design.