Here is a lesson found at Nancy Mill's site. This lesson is derived from the Mathematics Teaching in Middle School journal. You can read how a teacher used an artwork lesson to help students understand the visual relationship between decimals, fractions, and percents. The class created colorful pictures by gluing small squares to a grid. Once complete, they had to calculate the percentage each color was used in the picture, and represent that percentage in decimal and fractions as well. The students expressed their creativity and got a good math lesson out of it! Click here for more details on the activity.