[equiniphile]

Yep. I first heard of the color when I read Riding Lessons by Sarah Gruen, and the main character had a brindle Hanoverian show jumper. Here's an article on chimerism, which I think causes the brindle pattern.

http://www.horseforum.com/horse-articles/chimera-one-million-part-2-a-61376/

And here's someone with a brindle on HF:

http://www.horseforum.com/horse-breeding/got-my-brindle-colt-today-pics-65750/page13/#post824643