The art style depicted above is a form of decorative folk art that originated in the rural valleys of Norway. It uses stylized flower ornamentation, scrollwork, lining, and geometric elements that are often in flower patterns. It is traditionally painted on wood, but other painting techniques such as glazing, spattering, marbleizing, manipulating the paint with fingers or other objects, and etc are used.
The style originated around 1750 when artistic styles of the upper class, such as Baroque and Rococo, were introduced to into Norway’s rural culture. It first started in the low land areas of eastern Norway, particularly Telemark and Hallingdal, but also in numerous other valleys as well.
They are often painted on various pieces of furniture and decorative plates. You can read more about them on Wikipedia, where I got my information from! :)