I think that it would be really interesting if we had classes on Muggle art, photography (this would be SO much fun running around Hogwarts with Muggle cameras - of course, they'll need to be specially charmed cameras - acting like the paparazzi especially for my next character ), and even dance in different Muggle communities/countries (which could incorporate some additional music information from hip hop to classical as well). We can even learn how to do the waltz so when the next ball comes, we'll be dancing queens ... or kings.

And one thing that I always thought would be fun to do is have classes on cooking food the Muggle way. Our characters can learn how to properly use Muggle appliances that are used in the kitchen (and wonder if the light in the refrigerator really shuts off once you close the door ) and, eventually, have a cook-off with a flour fight at the end of it all. ... We can even invite the house elves to come over to class and show off their wicked cooking skills.