The Big Picture
One of the projects I often taught at the beginning of each semester involved making large murals using black bulletin board paper and metallic tempera paints.
At the end of each class, I would hang the paintings around the room to let them dry. It would take quite a few classes to finish them but the students loved the metallic paint.
Another big advantage of working this large is that it makes hanging art exhibits very easy, both in and out of school. The paper is very strong and doesn't tear easily so they stand up well for multiple exhibitions. I would keep and exhibit them all year. At the end of the year, I would cut them apart and give each student the part they painted.