Dad won't touch sauerkraut, but he'll eat cabbage like there is no tomorrow.
He'll stuff himself silly on one of my made up throw everything in the pot and see what sticks crockpot messes:
chopped up head of cabbage
sausage (usually kielbasa, but I've used New Orleans Boudin and a few others)
chopped onion
green pepper
a few cloves of garlic
vinegar (balsamic or red wine, which ever I have on hand)
If anything else will fit in the pot and seems like it would work, I'll throw that in too. Usually it's mushrooms.
I'm actually scared to try a similar trick with spinach instead of cabbage. He loves spinach even more that cabbage and I could see himself actually eating himself sick on that.