A system for blow-molding a three-dimensional part or article. The system comprises at least one regrind extruder system and at least one color extruder system, a forming system for forming a blank from the viscous mixtures released by the extruder systems and a blow mold configured to receive the blank. The blank has a layered configuration characterized by a number of layers across a cross-section of the blank. Each one of the layers is formed by one of the viscous mixtures released by the extruder systems. The blank is inflated inside the blow mold to form the three-dimensional part or article. The three-dimensional part or article retains the layered structure of the blank.