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

How to: Box fishtail headband braid with braided bun

Helpful tutorials:
Dutch 3D splitbraid (the technique is similair)
3 strand braid

You'll need:
2 small elastics
2 or 3 bigger elastics
Bobby pins
If desired, a flower or bow hair clip

How to do this hairstyle?

1. Part the hair just off center. Create a second part starting at the first part and going down to the ear, so you have a section of hair at the front of the head. Make sure to have this section on the side with the most hair.
2. Comb the rest of the hair backwards and tie it into a ponytail.
3. Now take a small strand of hair close to the part and divide this strand into two: a left strand (far away from the forehead) and a right strand (close to the forehead).
4. Take a small strand of hair from the left strand and divide it into two. Cross half over the left strand and cross half under the left strand. Then add both strands to the right strand.
5. Take a small strand of hair from the right strand and divide it into two. Cross half over the right strand and cross half under the right strand. Then add both strands to the left strand.
6. Repeat step 4.
7. Take some hair on the left side of the left strand, cross it under the left strand and add it to the right strand.
8. Repeat step 5.
9. Take some hair on the right side of the right strand, cross it under the right strand and add it to the left strand.
10. Repeat steps 6 through 9 until you've added in all of the hair.
11. Then repeat step 4 and 5 until you've gone past the ear and finish off with a small elastic.
12. Add the braid to the ponytail. You can do this by using another elastic or by lifting up the old ponytail elastic a little bit and pulling the end of the braid through.
13. Divide the hair from the ponytail (so including the end of the braid) into three and do a regular braid with this hair. Finish off with a small elastic.
14. Twist the braid around the ponytail elastic, so you'll get a bun. Put another elastic around the bun and use bobby pins to keep the bun in place.
15. If you like, you can hide the elastic from the braid with a flower or bow.

Good luck!