I stumbled onto The Perfect Pear blog a few days and found an awesome diy. I'm sure there are a zillion other great diys, but I'm still exploring the blog. This one is quick and I suggest jumping on it before Picnik closes. In her post Lauren shows you how to create a galaxy silhouette.
Hers looks so much better than mine, but this was my first go around with it. Pretty cool, huh?