zbones, this is what I feed mine (all measurements are for two pigs):
-- Unlimited timothy hay, although you can feed any grass hay (timothy, orchard, blue, brome)
-- 1/4 cup of Kleenmama pellets, but they don't usually eat all of it
-- 1 large red or green lettuce leaf (or the equivalent) in the morning and again in the midafternoon
-- 1.5-2 cups of veggies at night. They always get the equivalent of 1/4 of a medium-sized bell pepper, usually green but sometimes colored, depending on what I've got in the fridge. If the pepper is small, they get 1/3, if it's large, they get 1/6. They also always get two slices of Roma tomato (or two cherry tomatoes), a piece of carrot the size of a large baby carrot, and half the silks and husks of an ear of corn.
The other veggies I rotate -- 2-3 green beans, 2-3 slices of zucchini or summer squash, several sprigs of cilantro or dill or thyme, a few leaves of endive, celery leaves or chopped celery, a couple of wheels of corn cob with the kernels cut off (and very occasionally with the kernels left on). They get a bit of fruit every day or every few days. If every day, I limit it to one or two blueberries or a bit of apple peel or half a grape or half a cherry. If every few days, I'll give a whole grape or cherries or a little more apple peel or more blueberries. The fruit allotment is per pig, since I usually hand feed that at the side of the cage as a bribe to let me pet them without them running.
Occasionally I'll grow wheat grass in my kitchen window and give them a handful of that each day. They love it, and if my window were bigger, I'd do it more often.
Their favorite treat, hands down, is watermelon rind. I'll give them each a 1x3 inch slice with the green part cut off about once every two weeks, or I'll chop it in smaller pieces and give it a little more often.
Neither of them can tolerate romaine lettuce or much parsley without having powdery urine, and the abby can't have more than just an occasional bite of cucumber without having gas. They both love cucumber, and it doesn't bother the other one, but I've just quit buying it altogether. If we have some in salad, I'll give them a little bite, but not much.
My abby has a more sensitive stomach than the other one, and will occasionally get slightly mis-shapen poops. They're always softer than the other pig's poops, but usually the same shape. But if they get soft enough to be deformed when they step on them, or if they look like teardrops, then I cut waaay back on the veggies for a few days until things get better -- usually just to a little lettuce two or three times a day, and their bell pepper.
Hope this helps.