At the Quilt Show this past weekend at Alden Lane Nursery, I saw some incredible quilts. But I also saw an interesting decorative display. These oversized 'flowers' were made from the hard shell casing (not sure what they're called - anyone?) from Queen Palm trees. It looks as if these sturdy, leaf-shaped growths were split, giving them a bit of a frayed edge, and then pieced together to form gigantic flowers. There must be some sort of soil repository in the middle, as it's been stuffed with a filler of some kind and has cactus-looking plant life growing within. For all of you botanical experts out there, help me out here.
What are these 'petals' and center made from?