These top two pictures were colored by my four year old. He had a great time coloring them piece by piece. His favorite colors are pink and purple. When he finished he wanted to do another in yellow and orange. I was impressed with his desire to keep them symmetrical.
Here is my older sons's picture. He had fun making the circles into 3 different colors. I enjoyed his creativity. He is seven.
Here is mine. I remember one time Leah Day was coloring one of the pages in her son's coloring book with quilt patterns. So I had to try it. I colored all the shapes and then went back and filled them with background fill patterns in the same color. I love the result.