Digital 3D mosaics generation is a current trend of NPR (Non Photorealistic Rendering) field; in this demo we present an interactive system realized in JAVA where the user can simulate ancient mosaic in a 3D environment starting for any input image. Different simulation engines able to render the so-called "Opus Musivum" and "Opus Vermiculatum" are employed. Different parameters can be dynamically adjusted to obtain very impressive results. Categories and Subject Descriptors I.3.0 [Computer Graphics]: General; J.5 [Art and Humanities] General Terms Algorithms, Experimentation. Keywords Digital Mosaic, NPR