The Gregg Museum of Art & Design at NC State University has a great collection of folk arts. The strongest section is in ceramics, with stupendous representation from the NC wood-fired, salt and alkaline glazed traditions. There's this 1868 Hartsoe Alkaline glazed jug, this 19th cent. jug with kild-drip, this Hancock Half-Gallon jug, this Randolph Cty salt-glazed jug with ashy shoulder, and then the moderns: Burlon Craig, Vernon Owen, Mark Hewitt. There are also great photographs, weird furniture, outsider critters, and more. There isn't a good browse function, so you need some idea of what you want to search for.
The Mad Potter of Biloxi: with his 18-inch mustache, his technical expertise, his wildly altered pots, and his command of glazing, George Ohr was America's first art potter. Smithsonian Magazine article here (full pdf link at bottom of page). Left-handed tea pot. Vase.