Okay, here's mine:
1) A good set of withers. No matter what I'm riding, I really like a horse with a good set of withers to hold a saddle on. I hate having to cinch a saddle really tight, and I love a horse with the right kind of conformation to kind of naturally hold a saddle in place, like the one below:
2) A big kind eye. Although there are exceptions to every rule, most horse people will tell you that a horse with a big, sweet eye will naturally have a good disposition, and be kind and willing.
3) A nice fast walk. I love a horse that walks out on the trail, similar to the way the one below is walking naturally in the pasture. I love to ride a horse with a big, swinging ground-covering walk.
4) A Good Mind. Of course there is no picture of this trait, but for me, it's the one that trumps all. A horse that always tries to do the right thing, an honest horse that doesn't seem to mind doing his work and that brings you home safely each day - that kind of a horse is the best of all - no matter what their conformation, breed, or looks.
Okay, your turn. What do you look for in a horse? Let us know!