Wall Candy Arts Chalkboard Circles - BlackChalk these ChalkBoard circle stickers up to great design! Write a note, make a list or just create your own circle wall art. We didn't reinvent the wheel but we did patent this wall graphic in 18.5" circles that come in two different colors of green and ChalkBoard black. These bright bubbles of removable wall art will add personality to any room or wall space. Go ahead, express yourself.