here's Katie, wearing the saddle I sold my kayak to buy... its treeless and fits virtually any horse/pony. so far its been on Katie, Robbie, Smokey and Duke.
its a Barefoot Cheyenne, used with a Grandeur Saddle pad. it has a fiberglass form over the pommel and the rest of it is mostly padded foam, soooooooooooooo comfy.
it can make a real difference to the horse too, Duke in particular is a 20yr old thorougbred, dancing about on his toes and making his new owners nervous. I sat on him for about 5 seconds and decided his saddle was hurting his back(yes he was trying to politely tell them this, considering what he could have done!!), so I put my saddle on him and rode him and he turned into a different horse, quiet, responsive and kind. his owners have just ordered him a Barefoot after seeing him ridden in it a few times, good!!