A this age, we used collage a lot to help my son get over his frustration with the lag between motor skills and conceptual abilities, which was even greater for him than for most HG/PG kids because of his hypotonia and coordination problems. He had a big box full of little plastic bags filled with colored construction paper cut into different shapes and sizes - triangles, complex curves, circles, ovals, squares, rectangles, spirals, you name it. He would paste these together into an incredible variety of scenes to illustrate his stories. Sadly, his creations were all pretty much destroyed during the 2004 hurricanes, so I can't post photos to show you.

Another thing that he liked was using stencils and "swipes" to create his own art works. He would use tracing paper and a clipboard for the swipes and trace small sections from a variety of photographs or drawings that had part of a shape that he wanted to make and combine those lines to make his own compositions. Some of his favorite books to pull swipes from were these coloring books.