Polka dots backgrounds are used in a wide variety of art images. They are used on website backgrounds, as well as on curtains, tablecloths and other fabric, cell phone cases and to make fashionable prints for clothing.
Polka dots are often associated with the dance of that name. A few female politicians in recent times have worn polka dots on their toenails.
Polka dots are frequently used in Yayoi Kusama art images.
The next time you see polka dot backgrounds the cheerful dots might be in emails, on blogs, or on a Twitter background.