Choose from a wide selection of professional patterning tools or common household items like combs, spatulas, rulers, plastic wrap, etc. Use latex paints for positive methods, where fast drying can be a benefit. Work quickly to avoid lap marks. They will not be noticed while paint is wet, but will become apparent once dried and are difficult to repair. The slow drying of alkyd paints is ideal for negative methods.
Negative techniques go faster with two people.
One to apply the other to remove. Complete one wall or area at a time, stopping in a corner, or at a natural break. For a different look, try ragging finishes with paper, plastic bags, or feather clusters instead of rags. When tools become too saturated, have a dry one on hand to continue. A thin, even coat of glaze is best.