Cut tomatoes in half crosswise. Trim off the end of each half so that tomato cup will set upright. Scoop out insides of tomato with small spoon and/or melon baller. Spoon 1/2 teaspoon pesto into each tomato cup. Drain bocconcini and cut each piece in half. Use end of drinking straw to scoop out a little dent in center of the rounded side of each bocconcini. Use same straw to cut out "pupils" from olive halves. Place half a bocconcini in each tomato cup. Place olive inside the hole for pupil. For eyelashes, using scissors, cut the green top of the green onions into 1/4-inch pieces. Snip the onion ring so that you have a narrow strip. Use scissors to make multiple cuts almost to edge of strip. Tuck eyelashes into gap between cheese and tomato with toothpick. Makes 60 eyes (30 servings).