My daughter was turning 9 so we had a "Cloud 9" birthday party.  We asked everyone to dress celestial-like.  I hung silver stars outside in the trees, poured white chocolate moons and stars to decorate the cake with and also as guest gifts. We made pillowcases out of star and cloud fabric to use as prizes.  We had a "Mother Universe" attend to paint faces. Had a "cloud burst" (balloon drop) wherein I put numbers in the balloons and they had to pop the balloons and find the number 9 in the balloon to win a prize. We did a blue moon game with white and blue cotton balls.  We did a scavenger hunt with moon-shaped diecuts with numbers on the back of them. They had to find the die-cut with the "9" on the back of it. We had a limbo area with stars hanging all around.  It was a fantastic party!!!