I've seen some tutorials for this that use tape to get the shape perfect, but I have little patience for the drying time in between polishes that would take. No, I decided to go freehand, and I have to say it was easier than expected.
For my ruffian manicure, I used Nicole by OPI Please Red-cycle and Totally In The Dark. First, I did one good layer of red on the entire nail. I waited approximately 2 minutes before moving on to the black polish. Painting my nail the exact same way I do any other time, only starting a little further up so that the red would peek through the bottom:
I can't wait to see what color combos the other Twinsies came up with:
Maribeth at Obsessive Cosmetic Hoarders Unite