An assignment I half stole borrowed from Pinterest in a panic, trying to find something to fill in the gap for an assignment on color and value that the kids had done (mistakenly!!) last year. The only source I could find was in a language that uses the Cyrillic alphabet, so I have no idea about the origins.
Kids pick out a sneaker of choice (they were VERY excited about this), render part of it with only graphite pencils, and then use markers to color in the rest:
