Perhaps they will encourage you to think beyond the traditional site design and to be more original. Each of the sites has been chosen because of their originality in concept. They may not be high traffic sites or even from well known organisations, but they are all unique in some way.
I am not saying that I necessarily like the site or even find it's content interesting or relevant. I am saying that I applaud the creators ability not to be constrained and to "think outside the box".
For me one of the beauties of Joomla is that the time it saves in building a site and its content gives you more time to concentrate on the whole user experience.