My JH students drew animals and used magazines to create a mosaic effect using shades of one color. This was a pretty simple and straightforward assignment, so we really focused on the drawing aspect of the animal. We did several sketches and then drew them large on the paper. We kept it pretty simple in drawing too, focusing on the contour lines and on the inside of the animal only drawing lines where colors changed. Students then pulled out pages from magazines that were of the color they chose. Using small sections of those colors, they pieced the colors together, similar to a mosaic.
Here are some finished results: