The Python-based 2D simetri.graphics library, SİMETRİ, enables users to apply symmetry transformations with ease. We discuss how to create star shapes, a classic example of rosettes with a rich history, and overview an interlacing algorithm for crafting intricate over-under patterns by using SİMETRİ. The algorithmic approach used is an alternative to the traditional grid-based or compass and straightedge methods commonly used to create star shapes in Islamic geometric patterns.