Chinese history - A great tutorial for scratch your own Ming vases. scratch away the paint to reveal blue underneath. You could also do black and clay colors for Greek pottery or do different cultures such as Asia, Ancient Greece, etc.
The kids were given hexagon (to resemble a beehive comb) cardstock shapes and they traced this shap all throughout their pictures and then they pained each hextagon shape in a different watercolor paint. Then inked and printed cardboard bee on top.