Paint nail the color desired. Cut 5 very thin strips of scotch tape and place one down the center, with the others next to it. Once the tape is in place, paint the top color and remove as soon as the nail is painted. Add a top coat and you are finished.
Artistic results but very messy to DIY. You'll need a very small straw or coffee stir. Paint nails base color straw in varied nail polish bottles BLOW P.s wear clothes you dont mind getting nail polish on.