This would be a good DIY! Get plywood cut to order from your local hardware store. Mark the positions of the nails with something removable, like soap, fabric chalk or pencil. Then use the string of your choice to make a gorgeous sailboat.
colored pencil/ shading/ teaching value lesson--Medium blue construction paper background. darker blue for the shadow side and white for the lit side. Students choose colors for accessories and add snowflakes in the sky.