All About Pottery!

Two vessels from the Incipient Jomon Period (11,000-7,000 BCE). Note the relative simplicity, the designs adding only a subtle accent to the overall work. Attrib: Ismoon (talk) (merci Gaspard !) / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)
A pot from the Middle Jōmon Period (2,500-1,500 BCE). Note the extensive applique, the texturized spaces. Attrib.: I, Sailko / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)
Another Middle Jōmon Vessel, this one decorated in the “flame style.” Attrib.: しんぎんぐきゃっと / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)
A Dogū Figurine from Tōhoku (Far Northeastern Honshu), circa 1,000-400 BCE. Attrib.: World Imaging / CC BY-SA (https://creativecommons.org/licenses/by-sa/3.0)

Tōkyo National Museum Jōmon Exhibit – Lots of great pictures of various items which the Jōmon people used every day, including wooden baskets, pottery, Dogū

Cleveland Museum of Art Jōmon Pottery – Great virtual exhibit of Jōmon pottery from various angles, as well as helpful descriptions of their uses.

Chino City Jōmon Page – A pleasant English-language walkthrough of the Jōmon Period with lots of relevant artifacts unearthed in Nagano Prefecture.