add a little petroleum jelly around your fingers (keep it off your nails!), base coat your nails with the 'bottom' color, draw two stripes of color on a make up sponge and dab on your fingers to blend.
Omg...Freaking Genius! A neat way to stenil on a simple design onto nails. You can get the craft punch at a craft store! Punch out the shape into a low adhesive piece of tape. Next lay tape with shape cut out over desired nail...brush over shape in color polish you wish. Let dry and gently lift tape!