I've seen these floating around the internet, but not much instruction, so here it is. Yarn falls are often just locks of yarn attached to ponytails, but these are braids.
LOTS of yarn
2 Hair Ties
Something to wrap the yarn around
---I used a block of wood with nails in it that i use for other things
Step 1: Cutting the Yarn
Wrap the yarn around some immovable object, the length that you want them to be (keep in mind that is will be a little smaller.
You might have to do with more than once, but once you are finished just cut it off, tying them together at the top so that it doesn't all fall apart.
*My red yarn is all odd and curly because I had used it in another project that i didn't like