In our house summer = watermelon. I have to buy one every week for Eva and Daddy to devour. Their love of the fruit inspired this craft. All you need is a white paper plate, red, green and black paint and a Q-tip. To start Eva painted the inside of the plate red and then the rim green.
When that dried, I bent one end of the Q-tip to make a seed stamp for dabbing in the black paint.
You could then cut it into wedges when it dries but Eva wanted to leave hers whole.