Select a wide variety of fruits. You'll want to select fruit that doesn't contain too much moisture, like watermelon or peaches. But most all fresh berries, like fresh strawberries, blueberries and raspberries work really great. Kiwi is another popular choice and adds a nice green pop of color to the pizzas. Though fresh fruit is preferred, you can use canned mandarin oranges, especially because of their vibrant orange color. Just be sure and pat them dry really well with paper towels before decorating cookies.