What can be embroidered among the scattered windmills?

According to Renren Library, you can embroider your favorite patterns, such as flowers, animals, letters and so on, in the scattered windmill centers.

Windmill is a kind of power machine that can use wind energy without fuel. Early wind turbines were also called windmills. Modern wind turbines refer to wind turbines used for power generation, and some are also used for pumping irrigation.