Freeform, natural hand motions are imperfect, but uniform enough to create an overall pattern. The simplest way to achieve a textured look today is the use of textured paint. This is just a latex paint, thicker than usual, with texturing added. This is the most common method used today. The most important thing is to choose a texture finish that is appropriate for your application.
Manufacturers supply directions on different mixing procedures.
Be careful as to follow their specific guidelines when mixing for proper performance textured paint finishes can be applied with a spray. Besides spraying, you can brush, roll or sponge. Using a roller gives the wall a stippled look. Stucco brushes can be used to create swirl patterns. The variations are only limited by your imagination.