The possibilities are endless, and when summer fruits are out of season, try it with veggies!
Red: Strawberries, cherries, raspberries, cherry tomatoes, red peppers
Orange: Oranges, cantaloupe, peaches, tangerines, carrots, orange peppers
Yellow: Pineapple, bananas, squash, yellow tomatoes
Green: Kiwi, honeydew, avocado, grapes, green apples, broccoli, zucchini
Blue: Blueberries, blackberries, black olives
Violet: Purple grapes, plums, eggplant
For more colorful options, check out this great fruit and veggie color list from Fruits & Veggies--More Matters, and don't forget to eat a rainbow a day!