"Textured Painting - Natures Paint Brushes" This is not just art, but art in nature! Go on a nature walk to gather 'schtuff!' Then use what you gather to create art or As art!
Cole can paint pine ones for Xmas tree ornaments! Scissors and Spice: Scissors Craft: Pinecone Decoration Ideas for Christmas. And how to use up your pine cones and entertain kids at the same time - kids love paint!
Leaf printing - on shadow drawing?
Autumn-Messy Little Monster: Painted leaf monster craft