Paint the entire wall section using white paint. This will require you to use the paint roller and tray to cover the surface with a consistent covering.
Measure and mark every 12 inches along the length and 9 inches along the height of the wall.
Snap the chalk line across each mark to create an even template and divide each space by applying painter's tape along the chalk lines.
Apply brown paint using fabric to 1/3 of the squares. Dab on the color, allowing white to show through for details.
Apply tan paint using fabric to 1/3 of the squares. Dab on the color, allowing white to show through for details.
Apply green paint using fabric to 1/3 of the squares. Dab on the color, allowing white to show through for details.
Wait approximately two hours for the paint to dry.
Paint on fine details using a detail paint brush and black paint. The details added can be a lot or a little, depending on what you prefer.
Remove painter's tape and add any additional details to the wall.