The project starts by finding the center point on the biggest wall. From the center point, mark the wall every 12 inches. Use a level and a pencil to mark the vertical lines every 12 inches around the perimeter of the room. (A chalk line or laser line can also be used to mark the lines.) Next, apply painter's tape directly on the lines. Tape the ceiling, baseboard and window trim, so the paint won't drip on them.
After the first stripe dries, apply painter’s tape for the second stripe. Lay the new strip of tape on the left side of the tape that was used to mark off the first stripe (in the area that wasn’t painted). Line the new strip of tape perfectly with the existing strip of tape to ensure a uniform width on the stripe. Paint the second stripe soft beige to contrast the green stripe.