I started with a dark purple as a base coat. When that was dry I took a cosmetic makeup wedge sponge, and sponged the shimmery purple in a diagonal line, then the black on the edges diagonally. After that I sponged on the white, then the light purple around the white. After that I sponged more of the shimmery purple above and below the light purple, and then adding more black to the edges. After that was done I took a clear glittery nail polish and painted over the purples. Then I added white dots to look like little stars (which I think should be skipped, as I don’t think they look like stars). Once it was dry I put on clear top coat.
I’ve also done this with shades of blue, but I think I like the purples better..