Italian cuisine is probably one of the best for vegetarians. There are plenty of classic vegetarian dishes, and most things that aren’t vegetarian to begin with can be easily adapted. This vegetarian Italian recipe index includes both. (And the colors are great for 
Zucchini Parmigiana
One of the most delicious ways to use zucchini that I've ever found, and it's quick and easy too! This dish is perfect for parties and pot lucks, because you can make it the day before and it tastes great whether hot or at room temperature.