mustang, like the others posting, I also appreciate and enjoy the photo's. The horses and the scenery are just something I'm never going to see in person and your photo's are the 'next best thing' to actually being there.
We did see some wildly colored "Indian ponies" in a parade at Interior, SD at their July 4 celebration. One or two of them were painted in traditional patterns. Has anyone here heard of either a Brindle Dun, or Brindle Grulla color horse? A guy who shared a shade tree with us to shelter from a wickedly hot, sunny day, called a horse by that color name. Someone was riding it in the parade, and we never saw it later in the day, so never had a chance to ask the rider about it. It was more of the dark-ish Dun color than Grulla, imo. and it had black stripes or striations of black color running vertically the entire length of it's body, as I recall. Not sure if the stripes were going round the legs, or what, but it was very interesting and the only one either Shorty or I have ever seen marked liked that. The colors and marking patterns were quite similar to a brindle Brown Swiss milk cow we once had, so that term for the horses' color patterns does seem appropriate, to me.
Thanks for the fun times looking at the photo's, mustang. Most of what we hear or see about wild horses is politically slanted to make it seem they are all descended from the real mustangs, and are constantly abused and starved by "greedy ranchers abusing the land with too many cattle". I know many people know a lot more about horses than I do, but believe I can recognize or differentiate a good or even a great working ranch horse from a poor one, and many of those wild horses sure do look like they came right out of a decent to above average quarter horse or paint horse breeding program rather than from a true mustang bunch!