Preheat oven to 225 degrees. Line two baking sheets with nonstick baking mats or parchment paper.
Using a small melon baller, remove and discard pineapple "eyes." Using a sharp knife, cut pineapple crosswise into very thin slices. Transfer slices to baking sheets. Bake until tops look dried, about 30 minutes. Flip slices; bake until completely dried, 25 to 30 minutes more. Pinch center of each pineapple slice to shape into a cone, and let cool in a clean egg carton to form flowers. Refrigerate in an airtight container up to 3 days.