Mrs. Horne's most important contribution to Utah, however, was in art. In the 1920s, 1930s, and 1940s she promoted Intermountain artists by exhibiting and selling their paintings so they could earn a livelihood as artists. She advised art patrons, "In each home should hang a good picture, no matter how small." She held art exhibitions throughout the state, especially in prominent locations in Salt Lake City. "If you really want to learn what art is, live with it: make it a part of your home and of your experience," she advised. She determined that Utah children would have the advantage of original art around them by inspiring thirty-seven art collections in the state's schools, with scores of paintings by Utah artists. She also wrote and published Devotees and Their Shrines: A Handbook of Utah Art (1914), a child's play, Columbus Westward Ho! (1922), and a periodical, Art Stands, that carried news of art in Utah.