Straws dipped in nail polish to create this effect
In my original nails I chose a black base, but I like white much better. Then, using a tiny dotting tool (or a needle, possibly a toothpick, I used a #18/0 spotter brush) make a bunch of dots near the tip of your nail, so many that barely any of the base color shows through. You can use nail polish for this, but I chose to use acrylic paint. After that keep working in sections, using less and less dots and making the sections ever so slightly bigger until you reach your cuticle.