I got all my instructions from the book Braided Borders by Enrique Capone. The book costs $42.00 and is worth the price for sure. Here's the link to the book,
Briaded Borders - Enrique Capone
I've never done the mexican round braid as far as a braided border goes. So this pattern uses the over 2, under 2 pattern when you get to that point in the braid. The span is a hole 1 to hole 7. So it does span a longer distance and gives my better coverage and looks fuller when done. This pattern of course takes on that look of the herringbone type braid.
Hope that helps a bit. Feel free to ask anymore questions.
Thanks for the reply! I think what you have done is an expanded version of the Mexican round braid, I think that one goes from hole 1 to hole 4 and ends up with the over 2, under 2 pattern. I have used it several times but have to go back to look at the instructions to get started. I guess I'd better grab this book, a guy can't have too many instructional books. LOL! I may play with your braid and see if I can do it, it sure looks good.
I have a pair of reins that I got from Gene Flaten in a trade and on those he has wear leathers on the loops to connect the reins to the bit, he used some kind of elaborate edge braid on those and out of some tiny roo string. I will ask him what that one is called. I looks similar to yours only seems more "elongated," or stretched out, if that makes any sense. It's very full looking as well.