I love zucchini for foods like this.

For zucchini lasagna or for the pizza idea, you might want to try to get some of the water out of the zucchini. I slice it, rub salt all over it, let it sit for a bit, rinse well in a colander, then dry with paper towels. You can further dry it by frying it briefly. That helps prevent it from turning your recipe into soup in the oven. Also, use the thickest sauce you can find... or make. Simmer it down as thick as you can.

It can be a lot of work, but if you make a big batch, it freezes really well.