Add interest to a room by painting circles on the walls, or a touch of whimsy to a child's room with polka dotted walls. Create a modern display by painting a single large circle on a focal wall in a living room. However you decide to use circles, painting a perfect one, which is a fairly easy endeavour, is key to an attractive design.
Cut a length of string. The length of string should be half the size of the diameter of the circle you want to create.
Tie a pencil to one end of the string. Knot the end of the string securely around the pencil, making sure that it won't fall out of the string.
Affix the string to the wall. Determine where you want the centre of the circle to be. Use a tack to secure the end of the string opposite the pencil to the wall.
Draw a circle. Hold the pencil and pull the string tight. Move the pencil in a clockwise motion--the tack will serve as an anchor--creating a circle on the wall. Do not lift the pencil off the wall or allow slack in the string; doing so will result in a non-perfect circle.
Paint the circle. Use an artist paintbrush to paint around the outer edge of the circle. Paint the rest of the circle with a new angled-edge paintbrush.
Choose an object that is equal to the size circles you want to create. Examples of circular objects include dinner plates, bases of candles and bottoms of glasses.
Trace the circular object. Place the item on the wall. Use one hand to hold the item in place and use the other hand to trace around the object with a pencil.
Paint the circles. First paint the outer edges of the circles with an artist paintbrush. Paint the interior of the circles with a new angle-edged paintbrush.
When drawing the circle, make sure to press the pencil hard enough to the wall to create a pencil mark that can be seen easily.