Box fishtail

A box fishtail is similair to a 3D split braid, only you're using a fishtail braiding technique instead of a regular braid. Divide the hair into two, take a small strand from one section, split this strand into two and cross one half over and one half under the section and add both halfs to the other sections. Keep repeating this to create your braid.
You can also add in hair for a hair Dutch version of this braid: then first do the splitting part (small strand, one half over, one half under, add both to the other section) and then add hair by crossing it under the section you took the strand from and adding it to the section you just added your halfs to as well.

The technique:
Box fishtail tutorial (By PrettyHairIsFun, starts at about 3.00)

Ideas:

A melting braid with a box fishtail - you can basically add a box fishtail to any ponytail or to an accent braid hairstyle!

A very messy version of the box fishtail - fun for an older girl!

A half up box fishtail

Another half up box fishtail, combined with a bun

The box fishtail as headband braid by adding in hair - check out the How to to learn how to do this exact hairstyle!

A slightly pancaked version of the box fishtail with hair added in