I can see from the file where I keep the scans of my drawings that I am fairly obsessed with tree peony pods. I have lots of variations on this theme. It is something about those super shiny, grape sized black seeds emerging from the split in the pod that I find fascinating. At first, the pods are soft, fuzzy and green, but as they dry, they go through various colour changes, from green to yellow to red to brown and finally to a hard crusty black. I just love them.