If you are planning on collecting plants that are not on your own property, MAKE SURE TO GET PERMISSION. Oftentimes forest preserves, gardens, and arboreta have strict rules about what you may and may not collect. If a researcher has a project using seed pods, seeds, or other fruit materials, you might be taking their precious thesis material. Sometimes ambitious collecting severly disrupts the plant community and ecosystem. Any institution or gardener appreciates being asked and may make special accommodations for your project.
I haven't found a good solution to what to do with thousands of honeylocust pods (Gleditsia triacanthos var. inermis) besides to photograph the interesting ones. I'm thinking once they are truly dry, they would be an interesting garland.
One of my favorite unusual seed pods is magnolia, specifically umbrella magnolia (Magnolia tripetala). They are huge and get richer in texture in color the longer they are left in the open.
