Hundertwasser art project for kids that teaches warm and cool colors plus pattern and line. Student gallery
Paper trees. I make similar ones with first graders, but love the pompom idea for fall trees.
Kandinsky Circles Craft for Preschoolers
Start with a blue sheet of paper. Cut out a grass shape from a green paper. Cut out a tree trunk and branches shape from black or brown paper. Cut out various sizes of circles from fall colored papers then layer them.