Mucha produced a flurry of paintings , posters , advertisements , and book illustrations , as well as designs for jewellery , carpets , wallpaper , and theater sets in what was initially called the Mucha Style but became known as Art Nouveau ( French for ` new art ' ) . Mucha produced a flurry of paintings , posters , advertisements , and book illustrations , as well as designs for jewelry , carpets , wallpaper , and theater sets in what was termed initially the Mucha Style but became known as Art Nouveau ( French for ` new art ' ) .