Since the beginning of the twentieth century, randomness is one of the key pieces that constitute the language of art. The use of randomness is an essential characteristic of computer art, although other artists, as the Dadaists and the conceptual artists, also made use of chance in their creative processes. In this workshop we will explore some ways of using randomness in digital visual art, by means of provided examples. As a result of our exploration, we will use random numbers to generate a still image or an animation in Processing, a programming language for artists and designers.