The 1948 medals for the Arts were not anything unusual, the Olympics had had that category since 1912.
// For the first four decades of competition, the Olympics awarded official medals for painting, sculpture, architecture, literature and music, alongside those for the athletic competitions. From 1912 to 1952, juries awarded a total of 151 medals to original works in the fine arts inspired by athletic endeavors. //
Even before that, the 1908 London games had Cricket and Bowls competitions, as well as Tug of War.