They have made everything from snowmen to porcupines, things that turn, things that look like the solar system. I have, at times, added the slightest amount of glue to the paints along with the salt but you really don't need to. Blue and white rectangles for use at the easel can be in all sizes. Children can experiment with how white paint looks on white paper, or how blue paint looks on blue paper. And so on.
Children can also mix the blue and white paints to create shades of blue.
Or, make slush from real ice and let children paint with it and compare it to salt paintings.