Four types of leaves to download and laser-cut. You will need access to a laser cutter to make this project. Try looking up your local hackspace or maker space online.
Before cutting these out from 3mm birch plywood I have sprayed the wood various autumnal acrylic colours. The veins in the leaves are cut right the way through so they show on both sides.
To make them into decorations I used a quite heavy fishing line, not because I needed the strength but because it is easier to handle.