The pop art repeating image always makes for a fun and interesting art piece. Here are some student samples from when I was student teaching. These paintings make great beginning art assignments because advanced drawing skills are not required Drawing is usually the lesson where young artists get discouraged.
To make your own pop art painting you only need to draw your image one time. After that you can simply use a piece of graphite paper to copy the image over and over in the different squares. Once the drawings are in place it is time to start painting. Make sure to use some of the same colors throughout the painting to help move the viewer's eye around the piece going from similar to similar.