We can often come across plastic 3D furniture decorations that are made by injection molding. The molds (dies) are designed in 3D CAD software based on such 3D models and produced with CNC machines.
This 3D ornament has been modeled in Blender software and then the resulting polygonal mesh model has been converted into a NURBS model with Rhino software. Blender software is completely free and represents a very good substitute for commercial applications such as Autodesk 3ds Max, Maya, ZBrush and the like.