I make several kinds of clam chowder but last night I wanted Manhattan as I felt like veggies. ( I know to New Englanders Manhattan isn't real chowder) While my wife doesn't have a weight problem she does watch the carbs.
So instead of potatoes I substituted a turnip. Diced to 1/2" cubes and put in with the rest.
I actually think it's better. The sweetness of the turnip helped the chowder develop a broader range.
I'm not sure what other chowders would be like with this change but I think I'll try and find out.