Abstract: An assembly for forming or embossing a decorative pattern on at least one exposed surface of an elongated slat particularly of the type used in a vertical blind assembly. A pair of driven rollers are designed, disposed, dimensioned and configured to engage opposite sides of a slat immediately subsequent to its formation by a plastic extruder. The exterior surface of one of the rollers has the decorative patterns formed thereon and when forced into confronting engagement with an exposed surface of the slat, the decorative pattern is transferred by an embossing technique. The temperature of the rollers are regulated to facilitate transfer of the decorative pattern, continuous movement of the slat through the rollers and formation of the transverse or cross-sectional configuration of the slat concurrently to placing the decorative pattern thereon.