I love collage and so does my daughter. Today I discovered 111 COLLAGE DESIGN which has lovely artwork often about nature.
It reminded me of some of the simple tearing of papers and gluing and using found objects to create beautiful artworks that children and all of us can do. Look at the use of colour in ' Trees Can Grant Wishes.' - creating beauty by limiting the pallete. Thought this could be a starting point with all children from about 2 years of age when they can rip and glue - who doesn't love tearing paper and gluing?