I have a home built in 1950. I replaced a large fixed window (6'x8') with a smaller (4'x8') operable window. Under the new window is a new smooth GWB wall. Now I need to match the original swirling plaster pattern. It is a smooth finish with many coats of paint over it. There are places where they may have pressed a rag or cloth into it. Two photos are attached. Any suggestions on how to create this texture?