These ones have been done thousands of times before, and most of the ones I’ve seen looked better than this first attempt I did. But it did turn out better than expected, so I want to share it with you 🙂
For inspiration, I looked at this picture, which I found with Google: http://www.universetoday.com/22821/the-milky-way-and-andromeda/
As base, I used Catrice’s Steel my Heart, which is a perfect polish for this. Not quite black, but very dark grey and small sparkles in it.
The colors are sponged on, and the white spots were made with an old toothbrush. A lot easier than I expected, but a really fun mani to do!