Based on the principles of circular design, this paper aims to present the development process of PLAegg, a biodegradable, compostable, and recyclable composite produced from eggshells and polylactic acid. The material was developed within the scope of the We Won't Waste You project, a partnership between Design Studio of the Faculty of Engineering of the University of Porto and Matosinhos City Council, which through Oficina Design intends to reuse waste to develop new materials and products. Several experiments were performed varying the formulations and material processability. The Material Driven Design method was used as the validation procedure. The material developed was applied to a new product, a lamp named LEXI lamp. There was a concern about creating simple, functional, easy to produce, and maintain standard electrical components. Packaging, manual, and an estimate of the production costs of the final product were also developed.