This is a really quick and easy hairdo, which feels just that little bit nicer than a plain old pony tail...
All I do is pull my hair to one side below my ear (the side opposite to my part), and divide the hair into two sections. I then twist the two sections over the top of each other (like a plait, but with only 2 sections, not 3), and continue horizontally along the nape of my neck, until I reach the base of my other ear. I then gather the remaining hair together and tie it tightly with a hair band, so that the pony tail falls in front of my shoulder.
In this instance, I straightened the pony tail and added a flower clip to dress it up.
I also sometimes do the fish braid, and instead of leaving a pony tail, I curl the hair and randomly pin it in a messy bun.
Note - I do have to straighten the back of my hair before I start braiding, so that the hair at the back of my head looks straight. I also pull the two sections down really tightly as I am braiding, in order to avoid lumps and bumps ;)