If you study day and night, and the stars, here's a neat little art project.
Have the students copy a constellation. I've done a basic five-point star, a sun, and here, the Big Dipper.
One the stars are sketched on construction paper (I've also let them use white chalk and crayon on black paper), have them connect the stars.
Finally, they can cover the "stars" with Cheerios. I've also used stickers and glitter.