A bit of a backward french tip with the black for the tip and the white for the main colour. I added a thin french tip and tiny white dots and then put on black dots over the white main area. I think my thumb turned out the best, and the pinky finger is pretty good too.
The colours I used for this were Avon's French White Tip and Essence's Chic Reloaded. In certain lighting conditions the black looks purple on these nails.