Last spring when we studied the Persians, we made friezes out of wallboard. Wear a mask during this project because dust can fly!
The dc peeled off paper on the side they were going to work on. Then they had to keep it wet with a spray bottle and scraped in their design of choice. This is extremely inportant, to keep it wet, because of all the dust that flies. After they decided it was done, they painted it with a watered down glue solution to keep the dust from flying. Here is dd's butterfly and flowers.
Here is ds' under the sea.