I think that Moonbear may be with me on the same wavelength.
You can cut the apple through the horizontal midpoint. Since you cut medially, you will see each segment of the apple's ovaries where the seeds are...this will look like a star! You can use the star stamp with tempra or other appropriate paint for your receiving material(paper, cloth, etc).
You can also cut another apple the way we normally do for eating, use one half for one stamp and use a quarter face for an accent stamp.
Also, pick several types of red apples to show color variants, and do the same with yellow apples. Then there are the blush apples that are half yellow and half red with some pink tones. Last but not least there are a few varieties of green and other colors, especially Japanese variants.