I used the super cheap paper plates- not the coated kind. Students used orange, red, and yellow chalk pastels to make their suns. They drew concentric circles, alternating colors randomly, from the center of the plate to the outside edge. Then they used their fingers to smear the lines into each other.
My co-worker, Carina, did these constellation pictures with her students. They used animal stencils to make the outlines. I have done something similar to this before using animal shaped cookie cutters and paint instead of stencils. You can find other posts about the sun and stars here.