I have a dun and I think that green looks really nice on him..especially dk green. I have a dk green halter with southwest design that looks so nice on him but it is too big so I don't use it. I also have a brown/black that matches his colors.
I have misc. Halters too, leather show halters, nylon, breakaways and rope.
For trailiering I use the breakaway (just in case) and for general use I use the nylon . I never tie my horses solid with a rope halter, I mainly use it for ground work if I do tie them with it I use the Blocker Tie Ring.Blocker Tie Ring
Whatever you choose make sure it fits your horse correctly ...