I think garden twine would look neat at the corners, also for the hanging loop.
Minne-Mama: Fall Leaf Painting
Place tape in certain areas....then allow the children to paint with red orange green and brown....remove the paint
Fall Tree Craft Using a Dish Brush #Fall craft for kids - Perfect for toddlers and preschoolers! | CraftyMorning.com
Happy Berry Crochet: How To Crochet a Maple Leaf
Making a fall leaf wreath with kids.
40 Rustic Home Decor Ideas You Can Build Yourself - Page 3 of 9 - DIY & Crafts
Fall Leaf, Mason Jar Candle Holder | 35 DIY Fall Decorating Ideas for the Home | Fall Craft Ideas for Adults