Here's a tip for creating a unique bulletin board background for a unit on the solar system. I take a black or midnight blue roll of bulletin board paper and cut it to the size I need. I then take it outside and lay it down in the sun, securing the edges so it doesn't blow around in the wind. I take yellow tempera paint and a large brush and sprinkle, drizzle and splatter with the paint. This creates lovely stars, comets and galaxies as the paint splatters on the paper in small droplets. After it's dry, I hang it on the bulletin board and attach my planets and solar system posters.